RB says "file can not be found" but when I relocate it then says "this file is already in the location"

Hey Shane,

This happens because the song was added once, then moved, then added again, and you're trying to relocate the first one (now missing) by pointing it to the file which is already located by the second.

The only way to fix this would be to remove the more recently added duplicate existing in the location that you're trying to use to relocate from the first, then delete it from the collection, and properly relocate the first one.

Did you follow that? Let me know if you need more info.