Hi Chris,
what we call "a Playlist" normally is a folder (e.g. on a USB stick) that contains one or more Playlist files (.tsv), and the folder also contains the regarding Registration Bank files (.rgt), usually one Bank file for each Playlist record. The .tsv file(s) and the Reg Bank files can also be stored in subfolders of the main Playlist folder.
If you copy only a Playlist file into the User drive, this Playlist will still use the original Registration files on the USB stick, and when the stick is not connected the Playlist will not work because the Registrations cannot be found.
Note: If you want to use a Playlist completely from the User drive, it is not enough to just copy the Playlist file(s) and the Registration files from the USB stick into the User drive, because the User drive has a different drive letter, and there are additional (hidden) System folders for each file type in the User drive. Therefore, the Playlist file must be edited in any case to work correctly with the Registrations in User drive.
Best regards,
Chris