diff --git a/apps/worker/worker_app/core/asset_types.py b/apps/worker/worker_app/core/asset_types.py
index f798848d5..d28cb758a 100644
--- a/apps/worker/worker_app/core/asset_types.py
+++ b/apps/worker/worker_app/core/asset_types.py
@@ -1,7 +1,30 @@
 def infer_mime_type_from_storage_key(storage_key: str) -> str:
     lower_filename = storage_key.rsplit("/", 1)[-1].lower()
+    # Video
     if lower_filename.endswith(".mov"):
         return "video/quicktime"
     if lower_filename.endswith((".mp4", ".m4v", ".avi", ".mkv", ".webm")):
         return "video/mp4"
+    # Audio
+    if lower_filename.endswith(".m4a"):
+        return "audio/mp4"
+    if lower_filename.endswith(".mp3"):
+        return "audio/mpeg"
+    if lower_filename.endswith(".wav"):
+        return "audio/wav"
+    if lower_filename.endswith(".flac"):
+        return "audio/flac"
+    if lower_filename.endswith(".ogg"):
+        return "audio/ogg"
+    if lower_filename.endswith(".aac"):
+        return "audio/aac"
+    if lower_filename.endswith(".wma"):
+        return "audio/x-ms-wma"
+    if lower_filename.endswith(".amr"):
+        return "audio/amr"
+    if lower_filename.endswith(".opus"):
+        return "audio/opus"
+    if lower_filename.endswith(".weba"):
+        return "audio/webm"
+    # Default fallback
     return "image/jpeg"
diff --git a/tests/unit/test_generation_cover.py b/tests/unit/test_generation_cover.py
index 1398c5cba..e7065b34d 100644
--- a/tests/unit/test_generation_cover.py
+++ b/tests/unit/test_generation_cover.py
@@ -707,9 +707,9 @@ class TestStrayLoggerRemoved:
         source = inspect.getsource(generation_cover)
         # The stray call was logger.info(\n plan_id,\n generation_task_id,\n)
         # with no format string — should not exist
-        assert "logger.info(\n                            plan_id," not in source, (
-            "Stray logger.info(plan_id, generation_task_id) should be removed"
-        )
+        assert (
+            "logger.info(\n                            plan_id," not in source
+        ), "Stray logger.info(plan_id, generation_task_id) should be removed"
 
 
 class TestUploadCoverType:
diff --git a/tests/unit/test_worker_ingest.py b/tests/unit/test_worker_ingest.py
index a40a495a5..012c05f21 100644
--- a/tests/unit/test_worker_ingest.py
+++ b/tests/unit/test_worker_ingest.py
@@ -17,3 +17,48 @@ def test_infer_mime_type_treats_common_video_extensions_as_video():
 
 def test_infer_mime_type_keeps_unknown_files_as_image_placeholder():
     assert infer_mime_type_from_storage_key("uploads/abc/photo.jpg") == "image/jpeg"
+
+
+# ─── Audio extensions ───────────────────────────────────────────────
+
+
+def test_infer_mime_type_audio_m4a():
+    assert infer_mime_type_from_storage_key("uploads/abc/voice.m4a") == "audio/mp4"
+    # case-insensitive
+    assert infer_mime_type_from_storage_key("uploads/abc/VOICE.M4A") == "audio/mp4"
+
+
+def test_infer_mime_type_audio_mp3():
+    assert infer_mime_type_from_storage_key("uploads/abc/song.mp3") == "audio/mpeg"
+
+
+def test_infer_mime_type_audio_wav():
+    assert infer_mime_type_from_storage_key("uploads/abc/recording.wav") == "audio/wav"
+
+
+def test_infer_mime_type_audio_flac():
+    assert infer_mime_type_from_storage_key("uploads/abc/hifi.flac") == "audio/flac"
+
+
+def test_infer_mime_type_audio_ogg():
+    assert infer_mime_type_from_storage_key("uploads/abc/podcast.ogg") == "audio/ogg"
+
+
+def test_infer_mime_type_audio_aac():
+    assert infer_mime_type_from_storage_key("uploads/abc/stream.aac") == "audio/aac"
+
+
+def test_infer_mime_type_audio_wma():
+    assert infer_mime_type_from_storage_key("uploads/abc/old.wma") == "audio/x-ms-wma"
+
+
+def test_infer_mime_type_audio_amr():
+    assert infer_mime_type_from_storage_key("uploads/abc/voice_msg.amr") == "audio/amr"
+
+
+def test_infer_mime_type_audio_opus():
+    assert infer_mime_type_from_storage_key("uploads/abc/voip.opus") == "audio/opus"
+
+
+def test_infer_mime_type_audio_weba():
+    assert infer_mime_type_from_storage_key("uploads/abc/web_audio.weba") == "audio/webm"