I'm having the same issue as user Engztrom.

Phone: LG G7 One

Random files/folders do not show in search.

Files are able to be browsed via Foobar2000 on external storage(micro SD card in phone).

Files are playable via foobar external storage (so far the ones I noticed are .Flac, but my library is massive so it may be more)

Have tried re-scanning. Closing the program.

Thanks for any help you can provide.