A small bug may sometimes present itself and make the Upload or other buttons in HIP Mobile inoperable.
Quick Fix for Inoperable Buttons
Using the Delete all button to delete Inspection Files.
Step 1: Go to Settings in Mobile
Step 2: Near the bottom of the list click on Advanced Tools/Support
Step 3: Click Rebuild Inspection List
Go back and test the upload or any other inoperable button. They should be back to their working state. if not contact support for further troubleshooting.