diff --git a/packages/stage-pages/src/pages/settings/modules/speech.vue b/packages/stage-pages/src/pages/settings/modules/speech.vue
index da9142e1e..45558bf7e 100644
--- a/packages/stage-pages/src/pages/settings/modules/speech.vue
+++ b/packages/stage-pages/src/pages/settings/modules/speech.vue
@@ -149,6 +149,31 @@ function voiceAnalyticsPayload(
   }
 }
 
+/**
+ * Adds server-side TTS analytics metadata to official preview requests.
+ */
+function withManualPreviewAnalytics<TProviderConfig extends Record<string, unknown> | undefined>(
+  providerConfig: TProviderConfig,
+  providerId: string,
+  voiceType: VoiceType,
+): TProviderConfig | Record<string, unknown> {
+  if (providerId !== OFFICIAL_SPEECH_PROVIDER_ID && providerId !== OFFICIAL_SPEECH_STREAMING_PROVIDER_ID)
+    return providerConfig
+
+  const baseConfig: Record<string, unknown> = providerConfig ?? {}
+  return {
+    ...baseConfig,
+    extraBody: {
+      ...(baseConfig.extraBody as Record<string, unknown> | undefined),
+      airi_analytics: {
+        trigger: 'manual',
+        source: 'manual_preview',
+        voice_type: voiceType,
+      },
+    },
+  }
+}
+
 /**
  * Tracks the active TTS provider while preserving the legacy provider-card event.
  */
@@ -318,6 +343,7 @@ async function generateTestSpeech() {
   const previewVoice = voice
   const previewModel = model
   const previewProvider = activeSpeechProvider.value || 'unknown'
+  const previewAnalytics = voiceAnalyticsPayload(previewVoice.id, previewVoicePack, previewProvider)
 
   isGenerating.value = true
   errorMessage.value = ''
@@ -348,7 +374,10 @@ async function generateTestSpeech() {
         })
 
     const response = await generateSpeech({
-      ...provider.speech(model, speechRequest.providerConfig),
+      ...provider.speech(
+        model,
+        withManualPreviewAnalytics(speechRequest.providerConfig, previewProvider, previewAnalytics.voice_type),
+      ),
       input: speechRequest.input,
       voice: voice.id,
     })
@@ -364,7 +393,7 @@ async function generateTestSpeech() {
             trackVoicePreviewPlayed({
               tts_provider_id: previewProvider,
               tts_model_id: previewModel,
-              ...voiceAnalyticsPayload(previewVoice.id, previewVoicePack, previewProvider),
+              ...previewAnalytics,
               source: 'manual_preview',
             })
           })
@@ -403,6 +432,7 @@ onUnmounted(() => {
 })
 
 function updateCustomVoiceName(value: string | undefined) {
+  activeSpeechVoiceId.value = value || ''
   if (!value) {
     activeSpeechVoice.value = undefined
     return
@@ -417,7 +447,13 @@ function updateCustomVoiceName(value: string | undefined) {
     provider: activeSpeechProvider.value,
     gender: 'male',
   }
-  selectSpeechVoice(value)
+}
+
+/**
+ * Tracks a manual voice after the input value is committed by the user.
+ */
+function commitCustomVoiceSelection() {
+  selectSpeechVoice(activeSpeechVoiceId.value)
 }
 
 function updateCustomModelName(value: string | undefined) {
@@ -782,6 +818,7 @@ function handleDeleteProvider(providerId: string) {
               label="Voice Name"
               description="Enter the voice name for your custom voice"
               placeholder="Enter voice name (e.g., 'alloy', 'echo')"
+              @change="commitCustomVoiceSelection"
               @update:model-value="updateCustomVoiceName"
             />
 
diff --git a/packages/stage-ui/src/libs/providers/providers/official/index.test.ts b/packages/stage-ui/src/libs/providers/providers/official/index.test.ts
index 773308926..4c98ccfcc 100644
--- a/packages/stage-ui/src/libs/providers/providers/official/index.test.ts
+++ b/packages/stage-ui/src/libs/providers/providers/official/index.test.ts
@@ -2,11 +2,15 @@ import type { SpeechProviderWithExtraOptions } from '@xsai-ext/providers/utils'
 
 import { describe, expect, it } from 'vitest'
 
-import { OFFICIAL_TRANSCRIPTION_PROVIDER_ID, providerOfficialSpeech, providerOfficialTranscription } from './index'
+import { OFFICIAL_TRANSCRIPTION_PROVIDER_ID, providerOfficialSpeech, providerOfficialSpeechStreaming, providerOfficialTranscription } from './index'
 
 interface OfficialSpeechOptions {
   speed?: number
   extraBody?: {
+    airi_analytics?: {
+      source: string
+      voice_type: string
+    }
     voice_pack?: {
       pitch?: number
     }
@@ -39,6 +43,32 @@ describe('official speech provider', () => {
     })
     expect(request.fetch).toBeTypeOf('function')
   })
+
+  /**
+   * @example
+   * provider.speech('volcengine/seed-tts-2.0', { extraBody: { airi_analytics: { source: 'manual_preview', voice_type: 'official_selected' } } })
+   */
+  it('keeps streaming speech preview analytics on the generated request config', () => {
+    const provider = providerOfficialSpeechStreaming.createProvider({}) as SpeechProviderWithExtraOptions<string, OfficialSpeechOptions>
+
+    const request = provider.speech('volcengine/seed-tts-2.0', {
+      extraBody: {
+        airi_analytics: {
+          source: 'manual_preview',
+          voice_type: 'official_selected',
+        },
+      },
+    })
+
+    expect(request.model).toBe('volcengine/seed-tts-2.0')
+    expect(request.extraBody).toEqual({
+      airi_analytics: {
+        source: 'manual_preview',
+        voice_type: 'official_selected',
+      },
+    })
+    expect(request.fetch).toBeTypeOf('function')
+  })
 })
 
 describe('official transcription provider', () => {
diff --git a/packages/stage-ui/src/libs/providers/providers/official/index.ts b/packages/stage-ui/src/libs/providers/providers/official/index.ts
index 6b74496db..99b7d1dbf 100644
--- a/packages/stage-ui/src/libs/providers/providers/official/index.ts
+++ b/packages/stage-ui/src/libs/providers/providers/official/index.ts
@@ -234,14 +234,16 @@ export const providerOfficialSpeechStreaming = defineProvider({
   createProviderConfig: () => officialConfigSchema,
   createProvider(_config) {
     // Same audio-scoped baseURL as the HTTP speech provider. The streaming
-    // provider does not actually use `.speech()` for synthesis (it goes
-    // through `streamingSynthesize` which opens its own WebSocket), but the
-    // OpenAI-shaped provider instance is still returned so legacy fallback
-    // and feature-detection helpers keep working.
+    // provider usually goes through `streamingSynthesize`, but settings
+    // previews still use the OpenAI-shaped `.speech()` API so manual preview
+    // analytics must be able to pass extra request body fields through.
     const provider = createOfficialAudioProvider()
     const originalSpeech = provider.speech.bind(provider)
-    provider.speech = (model: string) => {
-      const result = originalSpeech(model)
+    provider.speech = (model: string, extraOptions?: Record<string, unknown>) => {
+      const result = {
+        ...originalSpeech(model),
+        ...extraOptions,
+      }
       result.fetch = withCredentials()
       return result
     }