Major High Sierra - iOS-14 sync issues
I'm running iPadsOS 14.01 on my iPad Pro and Catalina on my iMac. Notes appears to work fine. I haven't tested everything but I did add a picture and it immediately showed up in Notes on my ipad.
I also haven't tested all the options in Photo, but pictures i take on my ipad appear on my iMac as well.
Factime appears to work fine as well.
Again I haven't tested all the options but all 3 seem to work on my iPad Pro and my iMac.