Originally Posted by lefty100
If deleting a folder/last file in a folder/all files in a folder at once,
the folder doesn't exist in the list of folders but still exist in the phone as empty folder.
You need to delete it from the phone using file manager app
It's an intended behaviour. Folders may contain some other files too. MX Player deletes only media files within that particular directory.
I will convey your feedbacks to our developer team for future improvements on it.