This is an issue that has stood for a long time, and let's be real...
The current system for uploading planes is flawed, clunky, and in general, bad.

iOS and Android players both are at a huge disadvantage to PC players. PC is the best platform with the most modularity, sure. But, they are at an unfair advantage with sharing their builds.
Have you ever made an absolutely amazing creation, only to have it pushed aside because your thumbnail and photos don't pop out enough?
Let me elaborate. PC players can easily download a small mod for the game that lets them upload their own custom thumbnails for their creations. Nice, easy, and simple.

For Android players, you have to:
1. Download SimplePlanes 1.8. Good luck doing that without straight up pirating the game or going to shady websites filled with bad advertisements.
2. Get the DesignerSuite mod.
3. Put the mod in the "mods" folder and realise the mods don't work correctly.
4. Suffer and cry and give up.

For iOS players:
1. Good luck, you're not doing it.

Seriously, it's completely stupid. People with amazing builds sometimes don't get seen at all and get pushed aside by some mediocre at best plane.

I think almost many of us can relate.

You might argue that "it creates tons of work for moderators and developers"

No. That's just stupid. As much as we all appreciate the moderators and the work they do for us, it doesn't take any time at all for them to review it.

Or better yet, we leave it to the community to come together and do the right thing. It doesn't take much time to tag a moderator and tell them that someone's post is falsely advertising.

You also might argue that "it creates the opportunity for users to upload porn or worse pictures".

And while yes, this is true, it's still a dumb argument.
First, just make it so that people over a certain rank on the website (Silver or Bronze Rank) can upload custom pictures. Next, what you can do is IP banish the person who does the wrongdoing as a second measure.

Honestly, it would just make the community a lot happier. Please, consider this. Your votes help the community a lot more than you may think.