diff --git a/.gitignore b/.gitignore
index b023579bb..1099fd6f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,8 @@ docs/content/docs/*
 !docs/content/docs/plugins/
 docs/content/docs/plugins/*
 !docs/content/docs/plugins/ai-art-critique.mdx
+!docs/content/docs/backend/
+!docs/content/docs/backend/newapi-channel-2.mdx
 .env*
 !.env.example
 data/
diff --git a/backend/internal/protocol/official_catalog_test.go b/backend/internal/protocol/official_catalog_test.go
index 2927db4a9..2c7df04ee 100644
--- a/backend/internal/protocol/official_catalog_test.go
+++ b/backend/internal/protocol/official_catalog_test.go
@@ -377,6 +377,55 @@ func TestOfficialRollDekWanVideoUsesVideosLifecycle(t *testing.T) {
 	}
 }
 
+func TestNewAPIVideoGenerationsParsesNestedTaskIDs(t *testing.T) {
+	adapter := officialPackageAdapter(t, "newapi-video-generations-v1.yingce-plugin", "newapi-channel-2")
+	tests := []struct {
+		name    string
+		payload string
+		wantID  string
+	}{
+		{name: "snake case", payload: `{"data":{"task_id":"task-snake","status":"queued"}}`, wantID: "task-snake"},
+		{name: "camel case", payload: `{"data":{"taskId":"task-camel","status":"queued"}}`, wantID: "task-camel"},
+		{name: "nested upstream id wins over wrapper id", payload: `{"id":"49137","data":{"task_id":"task-upstream","status":"queued"}}`, wantID: "task-upstream"},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			created, err := adapter.ParseCreate(context.Background(), []byte(test.payload))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if created.TaskID != test.wantID || created.Status != StatusPending {
+				t.Fatalf("created = %#v, want task ID %q and pending status", created, test.wantID)
+			}
+		})
+	}
+}
+
+func TestNewAPIVideoGenerationsParsesNestedVideoResults(t *testing.T) {
+	adapter := officialPackageAdapter(t, "newapi-video-generations-v1.yingce-plugin", "newapi-channel-2")
+	tests := []struct {
+		name    string
+		payload string
+	}{
+		{name: "channel result URL", payload: `{"code":"success","data":{"task_id":"task-upstream","status":"SUCCESS","result_url":"https://cdn.example/channel-result.mp4"}}`},
+		{name: "provider nested video URL", payload: `{"code":"success","data":{"task_id":"task-upstream","status":"SUCCESS","data":{"status":"completed","video_url":"https://cdn.example/provider-result.mp4"}}}`},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			state, err := adapter.ParsePoll(context.Background(), PollContext{TaskID: "task-upstream"}, []byte(test.payload))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if state.Status != StatusSucceeded || state.Result == nil || len(state.Result.Videos) != 1 {
+				t.Fatalf("state = %#v, want one completed video", state)
+			}
+			if state.Result.Videos[0].URL == "" {
+				t.Fatalf("video = %#v, want a result URL", state.Result.Videos[0])
+			}
+		})
+	}
+}
+
 func TestOfficialOpenAIVideosDeclaresAuthenticatedResultDownload(t *testing.T) {
 	adapter := officialPackageAdapter(t, "openai-videos.yingce-plugin", "newapi")
 	capability, ok := adapter.(ResultCapability)
diff --git a/backend/internal/service/analytics.go b/backend/internal/service/analytics.go
index 6fff6f9a8..6f685997d 100644
--- a/backend/internal/service/analytics.go
+++ b/backend/internal/service/analytics.go
@@ -1000,7 +1000,11 @@ func (s *Service) enrichAPICallLogFailureSummary(log *model.ApiCallLog, response
 }
 
 func (s *Service) enrichAPICallLogPayload(log *model.ApiCallLog, payload map[string]any) {
+	nestedTaskID := ""
 	if data, ok := payload["data"].(map[string]any); ok {
+		if log.Capability == "video" && strings.Contains(log.Path, "/v1/video/generations") {
+			nestedTaskID = firstNonEmpty(stringField(data, "task_id"), stringField(data, "taskId"))
+		}
 		for key, value := range data {
 			if _, exists := payload[key]; !exists {
 				payload[key] = value
@@ -1064,7 +1068,7 @@ func (s *Service) enrichAPICallLogPayload(log *model.ApiCallLog, payload map[str
 		}
 		log.CachedTokens = firstInt64(usageMetadata, "cachedContentTokenCount")
 	}
-	log.ProviderRequestID = firstNonEmpty(stringField(payload, "task_id"), stringField(payload, "id"), stringField(payload, "request_id"), stringField(payload, "name"), log.ProviderRequestID)
+	log.ProviderRequestID = firstNonEmpty(nestedTaskID, stringField(payload, "task_id"), stringField(payload, "id"), stringField(payload, "request_id"), stringField(payload, "name"), log.ProviderRequestID)
 	log.ProviderStatus = strings.ToLower(firstNonEmpty(stringField(payload, "status"), log.ProviderStatus))
 	if log.ProviderStatus == "failed" || log.ProviderStatus == "cancelled" || log.ProviderStatus == "expired" {
 		log.Status = model.ApiCallStatusFailed
diff --git a/backend/internal/service/finance_token_test.go b/backend/internal/service/finance_token_test.go
index 02b18a070..638646c41 100644
--- a/backend/internal/service/finance_token_test.go
+++ b/backend/internal/service/finance_token_test.go
@@ -86,6 +86,25 @@ func TestEnrichAPICallLogReadsArkVideoUsage(t *testing.T) {
 	}
 }
 
+func TestEnrichAPICallLogPrefersNewAPIChannel2NestedTaskID(t *testing.T) {
+	tests := []struct {
+		name    string
+		payload string
+	}{
+		{name: "snake case", payload: `{"id":"wrapper-id","data":{"task_id":"task-snake"}}`},
+		{name: "camel case", payload: `{"id":"wrapper-id","data":{"taskId":"task-camel"}}`},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			log := &model.ApiCallLog{Capability: "video", Path: "/v1/video/generations"}
+			(&Service{}).EnrichAPICallLog(log, []byte(test.payload))
+			if !strings.HasPrefix(log.ProviderRequestID, "task-") {
+				t.Fatalf("ProviderRequestID = %q, want nested upstream task ID", log.ProviderRequestID)
+			}
+		})
+	}
+}
+
 func TestEnrichAPICallLogKeepsUserFacingAndUpstreamFailureDetails(t *testing.T) {
 	log := &model.ApiCallLog{
 		Status:     model.ApiCallStatusFailed,
diff --git a/backend/internal/service/protocol_runtime_test.go b/backend/internal/service/protocol_runtime_test.go
index 195d87a89..4eb960dcf 100644
--- a/backend/internal/service/protocol_runtime_test.go
+++ b/backend/internal/service/protocol_runtime_test.go
@@ -5,12 +5,14 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
 
 	"infinite-canvas/backend/internal/protocol"
 )
@@ -342,6 +344,129 @@ func TestDeclarativeProtocolRuntimeExecutesCreatePollAndDownload(t *testing.T) {
 	}
 }
 
+func TestDeclarativeNewAPIChannel2TaskNotExistRetry(t *testing.T) {
+	adapter := newDeclarativeNewAPIChannel2TestAdapter(t)
+	createCalls := 0
+	pollCalls := 0
+	var server *httptest.Server
+	server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/v1/video/generations":
+			createCalls++
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"id":"provider-task-1","status":"pending"}`))
+		case "/v1/video/generations/provider-task-1":
+			pollCalls++
+			w.Header().Set("Content-Type", "application/json")
+			if pollCalls <= 2 {
+				w.WriteHeader(http.StatusBadRequest)
+				_, _ = w.Write([]byte(`{"code":"task_not_exist","data":null,"message":"task_not_exist"}`))
+				return
+			}
+			_, _ = w.Write([]byte(`{"id":"provider-task-1","status":"succeeded","video_url":"` + server.URL + `/media.mp4"}`))
+		case "/media.mp4":
+			w.Header().Set("Content-Type", "video/mp4")
+			_, _ = w.Write([]byte("video"))
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	defer server.Close()
+
+	config := providerConfig{BaseURL: server.URL + "/v1", APIKey: "key", Model: "video-model", InterfaceType: "newapi-channel-2", AllowLocalChannel: true}
+	ctx := withProviderOutboundPolicy(context.Background(), config)
+	result, err := runProtocolAdapterTaskWithTiming(ctx, canvasGenerationInput{Mode: "video", Prompt: "a clip", Config: config}, adapter, protocolPollTiming{
+		InitialDelay:            time.Millisecond,
+		PollInterval:            time.Millisecond,
+		TaskNotExistWindow:      time.Second,
+		TaskNotExistRetryDelays: []time.Duration{time.Millisecond, time.Millisecond, time.Millisecond, time.Millisecond},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if result["mode"] != "video" || createCalls != 1 || pollCalls != 3 {
+		t.Fatalf("result = %#v, create calls = %d, poll calls = %d", result, createCalls, pollCalls)
+	}
+}
+
+func TestDeclarativeNewAPIChannel2TaskNotExistExhaustion(t *testing.T) {
+	adapter := newDeclarativeNewAPIChannel2TestAdapter(t)
+	createCalls := 0
+	pollCalls := 0
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/v1/video/generations":
+			createCalls++
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = w.Write([]byte(`{"id":"provider-task-1","status":"pending"}`))
+		case "/v1/video/generations/provider-task-1":
+			pollCalls++
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusBadRequest)
+			_, _ = w.Write([]byte(`{"code":"task_not_exist","message":"task_not_exist"}`))
+		default:
+			http.NotFound(w, r)
+		}
+	}))
+	defer server.Close()
+
+	config := providerConfig{BaseURL: server.URL + "/v1", APIKey: "key", Model: "video-model", InterfaceType: "newapi-channel-2", AllowLocalChannel: true}
+	ctx := withProviderOutboundPolicy(context.Background(), config)
+	_, err := runProtocolAdapterTaskWithTiming(ctx, canvasGenerationInput{Mode: "video", Prompt: "a clip", Config: config}, adapter, protocolPollTiming{
+		InitialDelay:            time.Millisecond,
+		PollInterval:            time.Millisecond,
+		TaskNotExistWindow:      time.Second,
+		TaskNotExistRetryDelays: []time.Duration{time.Millisecond, time.Millisecond, time.Millisecond, time.Millisecond},
+	})
+	var pendingErr providerStatePendingError
+	var httpErr providerHTTPError
+	if !errors.As(err, &pendingErr) || pendingErr.TaskID != "provider-task-1" || !errors.As(err, &httpErr) {
+		t.Fatalf("error = %#v, want typed provider pending error wrapping HTTP error", err)
+	}
+	if createCalls != 1 || pollCalls != 5 {
+		t.Fatalf("create calls = %d, poll calls = %d, want 1 and 5", createCalls, pollCalls)
+	}
+}
+
+func TestDeclarativeNewAPIChannel2TaskNotExistStrictClassification(t *testing.T) {
+	tests := []struct {
+		name          string
+		interfaceType string
+		taskID        string
+		err           error
+		want          bool
+	}{
+		{name: "error code", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist"}`}, want: true},
+		{name: "error message", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: `{"message":"task_not_exist"}`}, want: true},
+		{name: "other interface", interfaceType: "newapi-channel-1", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist"}`}},
+		{name: "missing task id", interfaceType: "newapi-channel-2", err: providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist"}`}},
+		{name: "other status", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 404, Body: `{"code":"task_not_exist"}`}},
+		{name: "unstructured body", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: "task_not_exist"}},
+		{name: "partial match", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist_later"}`}},
+		{name: "other provider error", interfaceType: "newapi-channel-2", taskID: "task-1", err: providerHTTPError{StatusCode: 400, Body: `{"code":"invalid_parameter"}`}},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := isNewAPIChannel2TaskNotReady(test.interfaceType, test.taskID, test.err); got != test.want {
+				t.Fatalf("isNewAPIChannel2TaskNotReady() = %v, want %v", got, test.want)
+			}
+		})
+	}
+}
+
+func newDeclarativeNewAPIChannel2TestAdapter(t *testing.T) protocol.Adapter {
+	t.Helper()
+	adapter, err := protocol.LoadManifest([]byte(`{
+		"apiVersion":"yingce.plugin/v1",
+		"id":"newapi-channel-2","version":"1.0.0","name":"NewAPI Channel 2","author":"Test","documentation":"# Test",
+		"contributes":{"providers":[{"id":"newapi-channel-2","label":"NewAPI Channel 2","capabilities":["video"],"scopes":["canvas"],"create":{"method":"POST","path":"/video/generations","fields":{"model":"request.model"}},"poll":{"method":"GET","path":"/video/generations/{{taskId}}"},"response":{"taskIdPaths":["id"],"statusPaths":["status"],"resultPaths":["video_url"],"resultKind":"video"}}]}
+	}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return adapter
+}
+
 func TestDeclarativeProtocolRecoveryQueriesExistingTaskWithoutCreating(t *testing.T) {
 	manifest := []byte(`{
 		"apiVersion":"yingce.plugin/v2",
diff --git a/backend/internal/service/provider.go b/backend/internal/service/provider.go
index 8491e4589..27fc1ff5d 100644
--- a/backend/internal/service/provider.go
+++ b/backend/internal/service/provider.go
@@ -150,6 +150,17 @@ type providerHTTPError struct {
 	RetryAfter time.Duration
 }
 
+type providerStatePendingError struct {
+	TaskID string
+	Cause  error
+}
+
+func (e providerStatePendingError) Error() string {
+	return fmt.Sprintf("上游任务状态尚未同步，将继续查询原任务（任务 %s）", e.TaskID)
+}
+
+func (e providerStatePendingError) Unwrap() error { return e.Cause }
+
 type providerAnalyticsKey struct{}
 type providerOutboundPolicyKey struct{}
 
@@ -2297,10 +2308,32 @@ func runDeclarativeProtocolTask(ctx context.Context, input canvasGenerationInput
 	return runProtocolAdapterTask(ctx, input, adapter)
 }
 
+type protocolPollTiming struct {
+	InitialDelay            time.Duration
+	PollInterval            time.Duration
+	TaskNotExistWindow      time.Duration
+	TaskNotExistMaxMisses   int
+	TaskNotExistRetryDelays []time.Duration
+}
+
+var defaultProtocolPollTiming = protocolPollTiming{
+	InitialDelay:            2 * time.Second,
+	PollInterval:            2500 * time.Millisecond,
+	TaskNotExistWindow:      15 * time.Second,
+	TaskNotExistMaxMisses:   5,
+	TaskNotExistRetryDelays: []time.Duration{2 * time.Second, 3 * time.Second, 5 * time.Second, 5 * time.Second},
+}
+
 func runProtocolAdapterTask(ctx context.Context, input canvasGenerationInput, adapter protocol.Adapter) (map[string]interface{}, error) {
+	return runProtocolAdapterTaskWithTiming(ctx, input, adapter, defaultProtocolPollTiming)
+}
+
+func runProtocolAdapterTaskWithTiming(ctx context.Context, input canvasGenerationInput, adapter protocol.Adapter, timing protocolPollTiming) (map[string]interface{}, error) {
 	request := protocolRequestFromInput(input)
 	taskID := resumedProviderRequestID(ctx)
 	var created protocol.CreateResult
+	createdProviderTask := false
+	syncWindowStartedAt := time.Now()
 	if taskID == "" {
 		spec, err := adapter.BuildCreate(ctx, protocol.RequestContext{BaseURL: input.Config.BaseURL, Request: request})
 		if err != nil {
@@ -2324,8 +2357,16 @@ func runProtocolAdapterTask(ctx context.Context, input canvasGenerationInput, ad
 		if taskID == "" {
 			return nil, errors.New("声明式协议创建请求没有返回任务 ID")
 		}
+		createdProviderTask = true
+		syncWindowStartedAt = time.Now()
+	}
+	if createdProviderTask && input.Config.InterfaceType == string(model.ChannelInterfaceNewAPIChannel2) {
+		if err := sleepContext(ctx, timing.InitialDelay); err != nil {
+			return nil, err
+		}
 	}
 
+	taskNotExistMisses := 0
 	for deadline := providerPollingDeadline(ctx); time.Now().Before(deadline); {
 		spec, err := adapter.BuildPoll(ctx, protocol.PollContext{BaseURL: input.Config.BaseURL, Model: request.Model, Request: request, TaskID: taskID})
 		if err != nil {
@@ -2333,8 +2374,26 @@ func runProtocolAdapterTask(ctx context.Context, input canvasGenerationInput, ad
 		}
 		body, err := executeProtocolRequest(withProviderRequestKind(ctx, "poll"), input.Config, spec)
 		if err != nil {
+			if isNewAPIChannel2TaskNotReady(input.Config.InterfaceType, taskID, err) {
+				taskNotExistMisses++
+				maxMisses := timing.TaskNotExistMaxMisses
+				if maxMisses <= 0 {
+					maxMisses = len(timing.TaskNotExistRetryDelays) + 1
+				}
+				if time.Since(syncWindowStartedAt) >= timing.TaskNotExistWindow || taskNotExistMisses >= maxMisses {
+					return nil, providerStatePendingError{TaskID: taskID, Cause: err}
+				}
+				delayIndex := min(taskNotExistMisses-1, len(timing.TaskNotExistRetryDelays)-1)
+				if delayIndex >= 0 {
+					if sleepErr := sleepContext(ctx, timing.TaskNotExistRetryDelays[delayIndex]); sleepErr != nil {
+						return nil, sleepErr
+					}
+				}
+				continue
+			}
 			return nil, err
 		}
+		taskNotExistMisses = 0
 		state, err := adapter.ParsePoll(ctx, protocol.PollContext{BaseURL: input.Config.BaseURL, Model: request.Model, Request: request, TaskID: taskID}, body)
 		if err != nil {
 			return nil, err
@@ -2348,13 +2407,29 @@ func runProtocolAdapterTask(ctx context.Context, input canvasGenerationInput, ad
 		case protocol.StatusFailed, protocol.StatusCancelled:
 			return nil, protocolResultError(state.Message, taskID)
 		}
-		if err := sleepContext(ctx, 2500*time.Millisecond); err != nil {
+		if err := sleepContext(ctx, timing.PollInterval); err != nil {
 			return nil, err
 		}
 	}
 	return nil, fmt.Errorf("声明式协议任务超时（任务 %s）", taskID)
 }
 
+func isNewAPIChannel2TaskNotReady(interfaceType string, taskID string, err error) bool {
+	if strings.TrimSpace(interfaceType) != string(model.ChannelInterfaceNewAPIChannel2) || strings.TrimSpace(taskID) == "" {
+		return false
+	}
+	var httpErr providerHTTPError
+	if !errors.As(err, &httpErr) || httpErr.StatusCode != http.StatusBadRequest {
+		return false
+	}
+	var payload map[string]any
+	if json.Unmarshal([]byte(httpErr.Body), &payload) != nil {
+		return false
+	}
+	code, message := providerFailureDetails(payload)
+	return strings.EqualFold(strings.TrimSpace(code), "task_not_exist") || strings.EqualFold(strings.TrimSpace(message), "task_not_exist")
+}
+
 // queryProtocolAdapterVideoTask performs exactly one read of an existing
 // declarative provider task. Manual recovery uses this path so it can never
 // create a second billable generation while checking a failed local task.
diff --git a/backend/internal/service/runtime_policy_test.go b/backend/internal/service/runtime_policy_test.go
index d0c8141a1..96bdab14c 100644
--- a/backend/internal/service/runtime_policy_test.go
+++ b/backend/internal/service/runtime_policy_test.go
@@ -35,12 +35,22 @@ func TestOnlyResumableNewAPIChannel2VideoDeadlinesStayRunning(t *testing.T) {
 	if !svc.shouldDeferVideoProviderTask(base, string(input), context.DeadlineExceeded) {
 		t.Fatal("resumable NewAPI Channel 2 deadline should remain running")
 	}
+	pendingErr := providerStatePendingError{TaskID: base.ProviderRequestID, Cause: providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist"}`}}
+	if !svc.shouldDeferVideoProviderTask(base, string(input), pendingErr) {
+		t.Fatal("resumable NewAPI Channel 2 provider sync delay should remain running")
+	}
 	if svc.shouldDeferVideoProviderTask(model.Task{ID: "task-2", Type: "canvas_video"}, string(input), context.DeadlineExceeded) {
 		t.Fatal("missing provider task id must not be deferred")
 	}
+	if svc.shouldDeferVideoProviderTask(model.Task{ID: "task-2", Type: "canvas_video"}, string(input), pendingErr) {
+		t.Fatal("provider sync delay without persisted provider task id must not be deferred")
+	}
 	if svc.shouldDeferVideoProviderTask(base, string(input), context.Canceled) {
 		t.Fatal("explicit cancellation must not be deferred")
 	}
+	if svc.shouldDeferVideoProviderTask(base, string(input), providerHTTPError{StatusCode: 400, Body: `{"code":"task_not_exist"}`}) {
+		t.Fatal("untyped provider error must not be deferred")
+	}
 	other, err := json.Marshal(canvasGenerationInput{Mode: "video", Config: providerConfig{BaseURL: "https://example.com", InterfaceType: string(model.ChannelInterfaceNewAPIVideo)}})
 	if err != nil {
 		t.Fatal(err)
diff --git a/backend/internal/service/task_worker.go b/backend/internal/service/task_worker.go
index 6613f3626..c17dff74d 100644
--- a/backend/internal/service/task_worker.go
+++ b/backend/internal/service/task_worker.go
@@ -180,15 +180,22 @@ func (w *taskWorkerCoordinator) processClaimedTask(task *model.Task) error {
 			return leaseErr
 		default:
 		}
-		if errors.Is(err, context.DeadlineExceeded) {
-			decryptedInput, decryptErr := s.decryptTaskInputJSON(task.InputJSON)
-			if decryptErr == nil && s.shouldDeferVideoProviderTask(*task, decryptedInput, err) {
-				if deferErr := s.repo.DeferRunningTaskForProviderPoll(task.ID, task.LeaseOwner, "后台仍在生成", 15*time.Second); deferErr != nil {
-					return deferErr
-				}
-				_ = s.log(task.UserID, task.ID, "info", "前台等待结束，上游视频仍在生成，将继续回查原任务", task.PollStage)
-				return nil
+		decryptedInput, decryptErr := s.decryptTaskInputJSON(task.InputJSON)
+		if decryptErr == nil && s.shouldDeferVideoProviderTask(*task, decryptedInput, err) {
+			stage := "后台仍在生成"
+			message := "前台等待结束，上游视频仍在生成，将继续回查原任务"
+			var pendingErr providerStatePendingError
+			if errors.As(err, &pendingErr) {
+				stage = "等待上游任务同步"
+				message = "上游任务状态暂未同步，将继续回查原任务"
 			}
+			if deferErr := s.repo.DeferRunningTaskForProviderPoll(task.ID, task.LeaseOwner, stage, 15*time.Second); deferErr != nil {
+				return deferErr
+			}
+			_ = s.log(task.UserID, task.ID, "info", message, task.PollStage)
+			return nil
+		}
+		if errors.Is(err, context.DeadlineExceeded) {
 			err = errors.New(taskTimeoutMessage(task.Type))
 		}
 		return terminal.handleExecutionFailure(task, err, providerSucceeded, channelSlotFailedBeforeRequest)
@@ -252,7 +259,16 @@ func taskExecutionTimeoutWithPolicy(taskType string, policy RuntimeTaskPolicy) t
 }
 
 func (s *Service) shouldDeferVideoProviderTask(task model.Task, decryptedInput string, err error) bool {
-	if !errors.Is(err, context.DeadlineExceeded) || strings.TrimSpace(task.ProviderRequestID) == "" || (!strings.HasPrefix(task.Type, "canvas_video") && !strings.HasPrefix(task.Type, "video_")) {
+	providerRequestID := strings.TrimSpace(task.ProviderRequestID)
+	if providerRequestID == "" || (!strings.HasPrefix(task.Type, "canvas_video") && !strings.HasPrefix(task.Type, "video_")) {
+		return false
+	}
+	deferSignal := errors.Is(err, context.DeadlineExceeded)
+	var pendingErr providerStatePendingError
+	if errors.As(err, &pendingErr) {
+		deferSignal = strings.TrimSpace(pendingErr.TaskID) == providerRequestID
+	}
+	if !deferSignal {
 		return false
 	}
 	var input canvasGenerationInput
diff --git a/docs/content/docs/backend/meta.json b/docs/content/docs/backend/meta.json
index ad9affd2d..009735dad 100644
--- a/docs/content/docs/backend/meta.json
+++ b/docs/content/docs/backend/meta.json
@@ -6,6 +6,7 @@
     "local-development",
     "code-map",
     "backend-database",
+    "newapi-channel-2",
     "system-update",
     "protocol-plugins",
     "canvas-data-structure"
diff --git a/docs/content/docs/backend/newapi-channel-2.mdx b/docs/content/docs/backend/newapi-channel-2.mdx
new file mode 100644
index 000000000..9b32b4d6b
--- /dev/null
+++ b/docs/content/docs/backend/newapi-channel-2.mdx
@@ -0,0 +1,49 @@
+---
+title: NewAPI Video Generations Channel 2
+description: Channel 2 视频任务创建、轮询与上游任务同步延迟处理
+---
+
+# NewAPI Video Generations Channel 2
+
+## 请求流程
+
+声明式插件使用以下接口：
+
+- 创建：`POST /v1/video/generations`
+- 查询：`GET /v1/video/generations/{taskId}`
+
+创建响应支持顶层 `id`、`task_id`、`taskId`，以及 `data.id`、`data.task_id`、`data.taskId`。当中转包装 ID 与真实上游任务 ID 同时存在时，按 `data.task_id`、`data.taskId`、顶层 `task_id`、顶层 `taskId`、`data.id`、顶层 `id` 的顺序解析，避免把中转内部记录 ID 用作上游查询 ID。宿主把解析出的值保存为 `provider_request_id`，后续查询始终使用该值，并对路径参数进行 URL 编码。
+
+查询响应进入成功状态后，插件会从 `data.result_url`、`data.video_url`、`data.output_url`、`data.url`、`data.metadata.url` 以及对应的 `data.data.*` 嵌套字段读取视频地址，再回退到兼容的顶层结果字段。只返回成功状态而没有任何结果地址时，宿主仍按协议异常处理，不会创建空资源。
+
+## 上游同步延迟
+
+创建接口返回任务 ID 后，Channel 2 可能在数百毫秒到数秒内仍对查询接口返回结构化的 `400`：
+
+```json
+{"code":"task_not_exist","message":"task_not_exist"}
+```
+
+宿主只在同时满足以下条件时把该响应视为“任务状态尚未同步”：
+
+1. 渠道接口类型精确为 `newapi-channel-2`；
+2. 已经保存非空 Provider Task ID；
+3. HTTP 状态为 `400`；
+4. JSON 的 `code` 或 `message` 精确等于 `task_not_exist`。
+
+不符合条件的 HTTP 错误、非 JSON 正文或其他错误码仍立即按失败语义处理。
+
+## 轮询与延期
+
+新任务首次查询前等待 `2` 秒；同步错误在同一次执行中按 `2` 秒、`3` 秒、`5` 秒、`5` 秒退避，最多短期查询 5 次。短期窗口耗尽后，Worker 不发送新的创建请求，也不切换渠道或退款，而是：
+
+- 保持本地任务状态为 `running`；
+- 保留原 `provider_request_id` 和计费状态；
+- 释放当前租约并把 `next_poll_at` 延后 15 秒；
+- 下一轮从已保存的 Provider Task ID 恢复，只发送查询请求。
+
+因此，上游生成耗时 500 至 600 秒时，本地会持续以低频查询等待完成，不会把正常排队误报为“模型服务拒绝了请求”。视频真正返回失败状态时，仍按供应商失败处理。
+
+## 兼容边界
+
+该容错只适用于 `newapi-channel-2` 视频任务。其他 NewAPI 接口、其他 Provider、缺少 Provider Task ID 的任务，以及真实参数错误不进入延期路径。
diff --git a/docs/content/docs/progress/pending-test.mdx b/docs/content/docs/progress/pending-test.mdx
index 8dd029461..0b10399c9 100644
--- a/docs/content/docs/progress/pending-test.mdx
+++ b/docs/content/docs/progress/pending-test.mdx
@@ -5,6 +5,14 @@ description: 当前项目已实现功能的手工验证清单与未确认边界
 
 # 待测试
 
+## NewAPI Video Generations Channel 2 轮询恢复
+
+- [x] 官方插件兼容从 `data.task_id` 和 `data.taskId` 读取上游任务 ID；Channel 2 创建成功后首次查询等待 2 秒，仅将结构化 `400 task_not_exist` 识别为上游同步延迟，并按 2 秒、3 秒、5 秒、5 秒退避复查同一任务。
+- [x] 短期重试耗尽后，Worker 保留本地任务 `running`、原 `provider_request_id` 和计费状态，延后 15 秒继续查询；恢复过程不重复发送创建请求、不切换渠道，也不立即失败或退款。其他接口类型、HTTP 状态和错误码仍按原失败语义处理。
+- [x] Channel 2 终态响应兼容 `data.result_url`、`data.video_url`、`data.output_url`、`data.url`、`data.metadata.url` 及对应的 `data.data.*` 嵌套路径；API 调用日志在该接口下优先记录嵌套真实任务 ID。协议与日志富化专项回归测试通过。
+- [ ] 使用真实 Channel 2 分别验证上游任务 ID 短暂不可见和生成耗时 500 至 600 秒的任务：本地不再提示“模型服务拒绝了请求”，创建请求只出现一次，后续始终查询同一 Provider Task ID，最终视频正常回写；真实参数错误仍应及时失败。
+- [ ] 使用返回 `SUCCESS` 且视频地址位于 `data.result_url` 或 `data.data.video_url` 的真实任务，确认不再提示“声明式协议已完成但没有返回结果”，并在当前 OSS 配置下成功下载并持久化为本地资源。
+
 ## 编辑器（M2 命令状态机）
 
 - [x] 命令协议黄金文件：`editor-commands` 8 个黄金 op（addClip/moveClip/trimClip/splitClip/removeClip/setClipProperty/addSubtitle/removeSubtitle）全量快照比对通过；未知 op、非法 payload 一律抛错（fail-closed）且输入不可变。
diff --git a/plugin-packages/generate-catalog.mjs b/plugin-packages/generate-catalog.mjs
index 896f12aee..5383f2513 100644
--- a/plugin-packages/generate-catalog.mjs
+++ b/plugin-packages/generate-catalog.mjs
@@ -357,7 +357,15 @@ add({
     video_urls: omit(map({ $sortByOrder: ref("request.videos") }, "media", ref("media.value"))),
     audio_urls: omit(map({ $sortByOrder: ref("request.audios") }, "media", ref("media.value")))
   }),
-  poll: { method: "GET", path: "/v1/video/generations/{{taskId}}" }, response: asyncResponse("video")
+  poll: { method: "GET", path: "/v1/video/generations/{{taskId}}" },
+  response: asyncResponse("video", {
+    taskId: coalesce(ref("response.data.task_id"), ref("response.data.taskId"), ref("response.task_id"), ref("response.taskId"), ref("response.data.id"), ref("response.id"), ref("taskId")),
+    videos: coalesce(
+      ref("response.data.result_url"), ref("response.data.video_url"), ref("response.data.output_url"), ref("response.data.url"), ref("response.data.metadata.url"),
+      ref("response.data.data.video_url"), ref("response.data.data.output_url"), ref("response.data.data.result_url"), ref("response.data.data.url"), ref("response.data.data.metadata.url"),
+      ref("response.video_url"), ref("response.videoUrl"), ref("response.result_url"), ref("response.output_url"), ref("response.url"), ref("response.metadata.url"), ref("response.output.url")
+    )
+  })
 });
 
 add({
diff --git a/plugin-packages/newapi-video-generations-v1.yingce-plugin b/plugin-packages/newapi-video-generations-v1.yingce-plugin
index 9398b99ca..42f634d4a 100644
Binary files a/plugin-packages/newapi-video-generations-v1.yingce-plugin and b/plugin-packages/newapi-video-generations-v1.yingce-plugin differ