Screen-Lock Breaks Uploads
UPDATE:
Adding feedback from @Tetsujin:
Apparently the developer of the app themselves can disable Screen-lock from activating while there's on-going activity. However, if they don't, the following is a hack to stop Screen-Lock from activating and busting your uploads.
In &quot;Settings,&quot;:
&quot;Display &amp; Brightness&quot; &gt; &quot;Auto-Lock&quot; and choose &quot;Never&quot;
Don't forget to restore the previous value to something more reasonable after your upload completes or you'll run your battery flat quickly.
It's a bit counter-intuitive that just because screen-lock kicks-in, your connections should all break.  If we say Screen-Lock is to stop an unattended phone being abused, it doesn't necessarily follow that you want all your uploads to be killed...