I'm currently on Sonoma 14.0 beta but some applications don't work and I want to downgrade back to the previous OS but I keep getting an error with the drive thet says 'the volume cannot be downgraded. Please help. I have created a back up but feel that I'll need to use a previous back up as the latest one is on the new OS

Hi all, I’m trying to add a file to a game on my iPhone via my MacBook. Now we have no iTunes connecting with the cable brings up the same menus however I’m being told I have to reset my iPhone back to factory settings to do this (see attached). I’m on IOS26 beta 6. A couple of questions I’ve backed up via iCloud, if I reset would I be able to reset it right back to my current set up with the beta, would I lose anything? Is there another way to connect to my MacBook to enable access to the games and files that would allow me to do a minor change without having to reset?