is this possible? i've seen many people say to use itunes but itunes is already not supported on my computer. I have access to the files app on my phone and found the file of my world, but i just dont konw where to put it on my mac so that i can see it when i open the game through steam
It's not possible to transfer the file from the Arcade version because it's not user accessible. The regular iOS version is though, which you can find via the Files app > On My iPhone. The Arcade version progress data is saved to Game Center in iCloud and you won't be able to get to it.
But if you have access to the farm file via the Files app, it sounds like you already have the regular version, not the Arcade version. Can you confirm that? The regular version is 1.5.6.39 and the Arcade version is 1.5.6.46.
If it is the regular version and you want to transfer the farm file, I found this Steam thread with the Mac file location:
https://steamcommunity.com/app/413150/discussions/0/352788917764758779/. You could upload the farm file from your phone to iCloud, and then download to the Mac location. The iTunes file transfer I believe went away with macOS Catalina.
Hope that helps.