

Just putting the ISO directly into the ventoy folder on the USB should just work, it’s odd that you had to mount it and drag the files. If you’re trying to use games installed on one drive between windows and Linux, I do not recommend attempting that. Windows can’t natively read Linux drive formats like ext4, and if you try to play games on an NTFS drive on Linux you WILL run into problems. Your cloud saves should just work normally though.
They just won’t function properly. There are permissions problems and while some games might work, you will run into games that simply won’t launch, or that have regular crashes, among other issues. I recommend installing the games you want to play on Linux there, and the ones you can’t on windows.