Windows 10 does not allow disabling automatic updates.
When windows reboots, the cache is cleared…even if there were uploads in progress.
Cache should not be cleared just on restart of the services.
Cached files need to be persistent through a reboot and uploads should either automatically resume or restart, or at least be given the option.
Having a manual purge option could help if anything hangs up, perhaps even at an item level if only one of many uploads is causing issues.