
I just bought a new computer and it's been tedious transferring every single file for re-organization. I wanted to use part of an old composition that was stored on my external hard drive, so I was lazy and opened it from there and made a new project from it rather than dragging it onto my new computer.
The file "/Volumes/MyExternalHD/Backups.backupdb/MyMacbook/2017-12-04/HardDrive/Applications/Ableton/Music/ProjectFiles/DemoEP/Track1.als" could not be opened. is the error I get whether I want to freeze/flatten, save, etc.
The only thing that works is "Save copy as" which I did this time on my computer, but of course it didn't provide a Samples folder.
A screenshot below of my finished project, which I made sure to use samples from folders on my new computer.

Is there a workaround, what's the easiest way to fix this other than not do it again? I'm afraid of closing out the project and re-opening the copy sans the samples if I'm uncertain it's actually been saved. Thanks in advance!