This is called iTunes File sharing, this is exactly one of the ways to put files into Vox. Indeed, Vox should easily display artworks of such files.
There are some recommendations for using this method:
- don't just drag audio files to Vox Documents directory, drag
folders! the best idea is having a folder per album. This way it is
easier for Vox to identify tracks belonging to the same album. The
artwork then can be embedded into files or placed as a picture in
the same folder.
Also, please send us some of files that have artwork embedded and do not display it in Vox.