Thanks Matt.

Yeah I'm a bit skeptical as to whether this can be done or not myself, but I was hoping someone with more experience would have good news for me 🙂

I executed:

RESTORE DATABASE DatabaseA

FILEGROUP = 'FS'

FROM DISK = 'D:\SQLBACKUP\FS.bak'

WITH RECOVERY,

CONTINUE_AFTER_ERROR

GO

And received the same error:

Msg 3116, Level 16, State 2, Line 1

The supplied backup is not on the same recovery path as the database, and is ineligible for use for an online file restore.