As far as I can tell it hasn’t compromised my game’s audio at all - the UE4 project opens fine and all my up-to-date sounds are being triggered just as they should. I’m very new to FMOD and I’m just wondering if someone can explain to me what those files do.
The three files in your screenshot are all in the “.unsaved” subfolder of your FMOD Studio project. This folder is used to store a record of unsaved changes made during an FMOD Studio session, so that if FMOD Studio ever closes unexpectedly (perhaps due to a power failure or crash), it will be able to restore those unsaved changes the next time you load the project. FMOD Studio automatically deletes this folder whenever you successfully save your project.
In other words, the deleted files are automatically generated backups that you no longer need, as the changes they describe have already been saved.