I've been trying to sync my Amazon Cloud Drive to my Windows 10 PC, but many files and folders would not sync onto my PC. I just spent several hours trying to figure out why these particular files/folders would not sync. There were no entries in the odrive log files that would indicate a problem. As it turns out, the files had invalid characters for Windows. It would have been really nice to see a list of files/folders that could not sync, with a reason why they could not sync.
BTW, I found out the files had bad characters by trying to download them manually from my amazon drive.