diff --git a/cozepy/audio/transcriptions/__init__.py b/cozepy/audio/transcriptions/__init__.py
index 29a89429..09cda298 100644
--- a/cozepy/audio/transcriptions/__init__.py
+++ b/cozepy/audio/transcriptions/__init__.py
@@ -31,7 +31,7 @@ def create(self, *, file: FileTypes, **kwargs) -> CreateTranscriptionsResp:
         """
         url = f"{self._base_url}/v1/audio/transcriptions"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
+        files = {"file": _try_fix_file(file)} if file else {}
         return self._requester.request("post", url, False, cast=CreateTranscriptionsResp, headers=headers, files=files)
 
 
@@ -60,7 +60,7 @@ async def create(self, *, file: FileTypes, **kwargs) -> CreateTranscriptionsResp
         """
         url = f"{self._base_url}/v1/audio/transcriptions"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
+        files = {"file": _try_fix_file(file)} if file else {}
         return await self._requester.arequest(
             "post", url, False, cast=CreateTranscriptionsResp, headers=headers, files=files
         )
diff --git a/cozepy/audio/voiceprint_groups/__init__.py b/cozepy/audio/voiceprint_groups/__init__.py
index 13244773..64538f37 100644
--- a/cozepy/audio/voiceprint_groups/__init__.py
+++ b/cozepy/audio/voiceprint_groups/__init__.py
@@ -169,7 +169,6 @@ def speaker_identify(
     ) -> SpeakerIdentifyResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/speaker_identify"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
         body = remove_none_values(
             {
                 "top_k": top_k,
@@ -177,6 +176,7 @@ def speaker_identify(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return self._requester.request(
             "post", url, False, cast=SpeakerIdentifyResp, headers=headers, body=body, files=files
         )
@@ -294,7 +294,6 @@ async def speaker_identify(
     ) -> SpeakerIdentifyResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/speaker_identify"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
         body = remove_none_values(
             {
                 "top_k": top_k,
@@ -302,6 +301,7 @@ async def speaker_identify(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return await self._requester.arequest(
             "post", url, False, cast=SpeakerIdentifyResp, headers=headers, body=body, files=files
         )
diff --git a/cozepy/audio/voiceprint_groups/features/__init__.py b/cozepy/audio/voiceprint_groups/features/__init__.py
index 43fc35ae..57a396ef 100644
--- a/cozepy/audio/voiceprint_groups/features/__init__.py
+++ b/cozepy/audio/voiceprint_groups/features/__init__.py
@@ -69,7 +69,6 @@ def create(
     ) -> CreateVoicePrintGroupFeatureResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/features"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
         body = remove_none_values(
             {
                 "name": name,
@@ -78,6 +77,7 @@ def create(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return self._requester.request(
             "post", url, False, cast=CreateVoicePrintGroupFeatureResp, headers=headers, body=body, files=files
         )
@@ -96,7 +96,6 @@ def update(
     ) -> UpdateVoicePrintGroupFeatureResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/features/{feature_id}"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)} if file else {}
         body = remove_none_values(
             {
                 "name": name,
@@ -105,6 +104,7 @@ def update(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return self._requester.request(
             "put", url, False, cast=UpdateVoicePrintGroupFeatureResp, headers=headers, body=body, files=files
         )
@@ -166,7 +166,6 @@ async def create(
     ) -> CreateVoicePrintGroupFeatureResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/features"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)}
         body = remove_none_values(
             {
                 "name": name,
@@ -175,6 +174,7 @@ async def create(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return await self._requester.arequest(
             "post", url, False, cast=CreateVoicePrintGroupFeatureResp, headers=headers, body=body, files=files
         )
@@ -193,7 +193,6 @@ async def update(
     ) -> UpdateVoicePrintGroupFeatureResp:
         url = f"{self._base_url}/v1/audio/voiceprint_groups/{group_id}/features/{feature_id}"
         headers: Optional[dict] = kwargs.get("headers")
-        files = {"file": _try_fix_file(file)} if file else {}
         body = remove_none_values(
             {
                 "name": name,
@@ -202,6 +201,7 @@ async def update(
                 "channel": channel,
             }
         )
+        files = {"file": _try_fix_file(file)} if file else {}
         return await self._requester.arequest(
             "put", url, False, cast=UpdateVoicePrintGroupFeatureResp, headers=headers, body=body, files=files
         )
diff --git a/cozepy/audio/voices/__init__.py b/cozepy/audio/voices/__init__.py
index ad47dbd1..4bf17200 100644
--- a/cozepy/audio/voices/__init__.py
+++ b/cozepy/audio/voices/__init__.py
@@ -140,7 +140,7 @@ def clone(
                 "description": description,
             }
         )
-        files = {"file": _try_fix_file(file)}
+        files = {"file": _try_fix_file(file)} if file else {}
         return self._requester.request("post", url, False, cast=Voice, headers=headers, body=body, files=files)
 
     def list(
@@ -265,7 +265,7 @@ async def clone(
                 "description": description,
             }
         )
-        files = {"file": _try_fix_file(file)}
+        files = {"file": _try_fix_file(file)} if file else {}
         return await self._requester.arequest("post", url, False, cast=Voice, headers=headers, body=body, files=files)
 
     async def list(