I’m just adding to this thread after scratching my head about the order in which my SoundCore Mini plays MP3s from the Micro SD card.
I imagined it might do so by file name (A-Z, say) but it actually appears it’s playing them according to the files’ Date Created. I’m on a Mac, and worked this out by deliberately editing these dates/times using help I found here:
Important: it appears to be playing the newest files first, then steps back in time. Hope this helps someone!