I was trying to move files from another machine (a Synology NAS) to a new Unraid v6.10.2 server. I noticed that certain files cannot be moved to the new Unraid shares: Windows gave the error message "Error 0x80070299: The requested operation could not be completed due to a file system limitation". However, the same files could be moved without issue to a Windows PC's hard drive formatted with NTFS. Despite this, moving first to Windows and then to Unraid would not work.
I eventually got the files to transfer by first transferring to an old Unraid server running on v5.0.6, which returned the message "are you sure you want to copy this file without its properties? The file ...mp3 has properties that can't be copied to the new location". After confirming, I could in turn transfer them to the new Unraid server without issue. My old Unraid server disks are using reiserfs, while my new Unraid server's disks are xfs encrypted, and its cache pool is btrfs encrypted.
So I'm curious, what could be these "file system limitation" or "file properties" that are causing the transfer to fail? How come transferring the files to the old reiserfs-based Unraid disks allowed the incompatible properties to be removed, but not when transferring to the new xfs and btrfs Unraid disks?