You came back to the tab and it sent you to the sign-in page.
Two clocks run:
- 30 minutes idle. No interaction for half an hour signs you out. The sign-in page tells you that's what happened. Two minutes before, Rhodes asks Still there? — choose Stay signed in to keep going.
- 12 hours total. A hard ceiling from when you signed in, regardless of how active you've been.
Sign back in with the same button and you'll land on Home (or choose an organization, if you have more than one). Nothing you'd submitted is lost, and documents already uploaded keep processing while you're signed out.