Determine if the phone supports cover art image files and the right filename and format My music library master is stored in my PC, and I sync to my phone on a regular basis. Most of my album covers are stored in separate image files inside the related album folder, whereas very few of them are embedded in songs metadata.

Now, I noticed the stock ROM player in my phone is not able to handle the covers in separate image files; only covers embedded in metadata are shown.
So I googled around and I understand now there is no guarantee a certain player can handle separate albumart pictures and there is no fixed filename and format.

So I'd like to know if there is a way to determine if a player can handle separate albumart pictures and the filename and format it uses (e.g. AlbumArt.jpg).
If you're using the Google Play Music app (which is the stock music player in many phones, and is available for phones running Android 2.2 up if not) to play your music then this Google Support article "Copy music files directly from your computer" says:


  If your music files have accompanying artwork in .jpeg format, rename
  the art file albumart.jpg and include it in the same folder as your
  music files.