Hi Axell
It seems you are doing everything right, so this should be some problem in the uTool in this specific scenario where the song location changed manually, then the uTool is not storing the changes for some reason.
Anyhow, we already working on the new uTool with the new version managing the song project in different way, and you don’t need to copy manually, because you’ll able to make a copy from the song project with the source files.
I’m sorry for the inconvenience caused to you.
I would like to ask for your forbearance until we release the new version.