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One of the worst defects for usability of this player, is the user interface truncating ID3 tags: album name, track title, artist name, everything is truncated in player screen. This is very unpleasant, considering the fact that the display would be wide enough to show much more.
I tested the player uploading an archive of tracks organized into directories, i.e. every directory contains all the tracks from a single album and every track is named as "%n %t" (track number, title). It turned out that if a picture named folder.jpg exists into the directory (a convention used by the Kodi multimedia player), that picture is shown during tracks playback. Unfortunately that picture will hide the ID3 tags, even the filename of the playing track is replaced by the picture filename: a very silly behaviour! Other times I got chineese characters instead of the image name, mixed with part of track name; so definitely there are bugs in the management of file names, where the Vfat filesystem is a source of countless problems.
It is also unclear why the image is sometimes resized correctly to occupy the entire available space, other times it remains much smaller.