Just try to reboot your device 
As far as I know (and my knowledge may need a little refresh with recent Android ):
- many apps relies on Android MediaProvider, including eDrive
- the MediaProvider database is probably populated on filesystem events, at least for sure on boot
=> that’s to say: at next MediaProvider database refresh, your folder may be excluded and then invisible to Music app, as well as eDrive.
Unfortunately, I’m not aware of an easy solution here. Maybe renaming the folder with a leading dot could do the trick with eDrive, but it may also affect MediaProvider and other apps as well.
Another option when using .nomeda files could be to use apps that don’t rely on MediaProvider, like the excellent foobar2000 for audio (please read https://www.foobar2000.org/temp/MANAGE_EXTERNAL_STORAGE.txt).
added for reference (quite old): Music app not detecting newly added music files - #12 by smu44