NinjaGeoff

I had this issue and finally fixed it by downgrading to 6.7.2 (Tools > About/Update OS). I was then able to transfer to my UNRAID server again. After I uploaded a 20 GB file, I upgraded to 6.8.3 again, and it's working as expected. I had tried all the different recommended settings in Windows 10 (this was even on a fresh install of 10 Pro) as found in the link elsewhere in this thread, tried multiple different Windows 10 machines, verified they could send and receive files to each other, and ran the Docker Safe App Permissions tool, none of which helped. I wish I had thought to use a linux machine to try to upload a file to the share, but I didn't think of it until after I did the downgrade to 6.7.2.