diff --git a/electron/mediaTypes.test.ts b/electron/mediaTypes.test.ts
new file mode 100644
index 00000000..9bcff6fe
--- /dev/null
+++ b/electron/mediaTypes.test.ts
@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+
+import { getMediaContentType, isSupportedLocalMediaPath } from "./mediaTypes";
+
+describe("mediaTypes", () => {
+  it("recognizes .m4a as audio/mp4", () => {
+    expect(getMediaContentType("recording.m4a")).toBe("audio/mp4");
+  });
+
+  it("supports .m4a as a local media path", () => {
+    expect(isSupportedLocalMediaPath("recording.m4a")).toBe(true);
+  });
+});
diff --git a/electron/mediaTypes.ts b/electron/mediaTypes.ts
index 5c4307b6..a27fb39a 100644
--- a/electron/mediaTypes.ts
+++ b/electron/mediaTypes.ts
@@ -8,6 +8,7 @@ export const MEDIA_CONTENT_TYPES: Record<string, string> = {
 	".avi": "video/x-msvideo",
 	".wav": "audio/wav",
 	".mp3": "audio/mpeg",
+	".m4a": "audio/mp4",
 	".ogg": "audio/ogg",
 	".png": "image/png",
 	".jpg": "image/jpeg",