Troubleshooting & messages · Undo, move back and Recycle Vault
What does "Some of our notes about files moved to your fast drive couldn't be read" mean?
Short answer: Some move records couldn't be read, so Storage Studio won't manage those items rather than guess. The files themselves are intact — contact support and don't delete anything meanwhile.
Storage Studio's records for some moved files couldn't be read — for instance after a crash while they were being saved. Nothing has been lost: the files are where they were moved to. Storage Studio just won't manage (move back or tidy) those particular items until the records are sorted, rather than guess.
Contact support with the message; they can help restore the records. Don't delete anything on the drive in the meantime.