I setup my mother's computer to download lots of kid pictures from me (about 30 GB in a single zip file). We set it up as a background transfer, and left it to go overnight. Her computer went to sleep, and the transfer paused. When she started using the computer again, the transfer restarted.
I think that this is similar to https://winscp.net/forum/viewtopic.php?t=5867, but I'm not sure if it's something different with Windows 10, background transfers, or something else. Is a pause during a background transfer expected?