I have been asked this far too many times. so I am creating a forum about it.
Step 1: Have a plane that you are ready to upload and open the share aircraft screen.
Step 2: take two pictures but wait on the third.
Step 3: Take the third and immediately (within about 0.08 seconds) click the take screenshot icon.
Alright, no you know how to do it, and some helpful side notes, if you miss the time window, than you will have to start over. Also sometimes it will freeze up.
@50CalChicken thx for XPlane (Explain)
@MrCOPTY yeah, it's an interesting glitch, but as you can see, it works
@50CalChicken Interesting.
@Clutch oh, forgot it.
@Clutch I had it, but I needed to ask, any other modifications you want?