First step, go to Share App, enable the “Default to fullscreen” function, copy the code, and open it in a new tab. It is very important to enable the fullscreen option.
Then, once in the new tab, the buttons will work correctly. It is very important not to press “Leave fullscreen” again, because it will stop working.
From that screen, you can reload the page, change the device view, and use fullscreen mode without issues.
I recommend using two pages: one for screenshots and files, and another one to view the app in fullscreen.
