Would it be possible to get a link to the source of the mp3 file? That way I can try to find out what's causing the issue. It would also really help if you could send me a screenshot of the directory path for the music files. If this isn't too much trouble for you.
here’s the link for the first file http://zapsplat.net/zapsplat-sounds/download.php?fileName=pm_rd_rain_23_city_modarate_drippy_362.mp3&expiry=1581591517
because I’m using an iPad the file browser doesn’t let me show a file tree, but I have put the files in epicGM>sounds>AMB