Looks like this problem is widespread. And still hasn't been figured out by Apple going on months. Got my 13" M1 MBP Wednesday and no matter what I do, it just won't sync files to iCloud (I tried all the stuff they take you through). Friend of mine has the M1 Air...same exact issues, completely different ISP. Over the last few years, I've trusted iCloud to store my production files. And even though I did plenty of backups before this test, it looks like the M1 is going to be a $2K test machine. Like many of you, I'm going to watch them work out the bugs and hopefully do so before they release their flame thrower 16" next year. I want to love this chip, but the last 2 days have been a bumpy ride or crashes (photos, Photoshop Beta, Creative Cloud--crash crash crash) here and there and some questionable performance/flickering connected to my BenQ monitor. A couple times Safari wouldn't come back after minimizing and I have to open a new window. I'm keeping track of everything to report in. Hope you guys are having a better experience other than the iCloud sync. My 15" MBP is standing by for the real work until all this smoothes out.