How to find/delete originals of files in emulated folder

Hi. I have .mp3u files that show in /storage/emulated/O/Playlists. I want to delete them because when my Sonos music speaker scans for Playlists it's picking these up and I don't want them to appear with Sonos. My understanding is that these 'files' in the emulated folder are not files as such - they are just references to the original files. So I need to delete the orginals - then the emulated 'versions' will no longer appear. But I can't find any sign of the original files? I've tried a couple of search apps but no luck (although they did find the ones in the emulated folder.) Any help thoughts appreciated. Thanks

 

Thanks - tried that. But no sign of the 'main' versions (nor the 'emulated' versions.)

 

Finally managed to sort it. I tried 3 more file managers - none found the files. Then I tried RS File Manager which found them and allowed me to delete. So your point about finding a suitable file manager helped. Thanks.