Answer
Uploading a photo is optional. If needed, Hashchats generates the profile image and thumbnail before completing setup. The photo form shows pending work while Done is busy. Navigation and inputs remain unavailable during required saving or photo work.
If Profile Saved says the next screen could not open, tap Done to retry navigation without repeating the confirmed save. Incomplete setup offers Log Out to switch accounts; setup is still required on return. Required fields keep visible labels and show errors beside the field.