Graphics become very weird when game is launched on mobile platform

So I’ve been making a mobile game in UE4, and I’ve come across a rather big issue.
When I launch the game on mobile, the graphics go very weird. I used a cel shader and outlines (using post-processing) which I believe is the cause of the issue.
Also, it’s still in development, so there may be some stuff missing or whatever.
This is what the normal image (when playing on the computer) looks like (also what I want it to look like on mobile):

And this is what it actually looks like on mobile (I moved the skateboard around a bit):

If you need it, here’s the link to download the project:
http://www.mediafire.com/file/xg2d8shd3fbe5qd/Island%20of%20Minigames.zip

Thanks for the feedback, I may have used the file full of my resources instead of the actual game. Sorry 'bout that.
I’ll check out the docs, but it would be better if you posted your comment as an actual answer, so I can mark it as a correct answer and stuff.

Hi CannonBall3000,

The file link you provided does not include your uproject file. Also some post processing effects are not support by mobile. I recommend taking a look at the documentation below as it has listed out what is and is not supported:

Here’s the link to the actual project. I removed the cel shader from the volume tho.