On a phone the bar at the bottom of the screen keeps the Dashboard and the aircraft you are on at your thumb. Swipe it sideways to walk through that aircraft’s sections. The top bar has search, the apps button, the bell and your account.
Every “Upload photo or doc” button opens your phone’s own chooser: camera, photo library, or files. A picture just taken and a PDF already saved arrive the same way. On a computer, you can also drag a photo onto the button from File Explorer or Finder. An iPhone photo (HEIC) arrives as a JPEG.