PNG’s import very well to UE4, along with TGA
Just remember to use image sizes that are multiples of 2. You can then use them however you want, whether you apply it in a material to a mesh or use it with the UI system (Unreal Motion Graphics)
So can you give me an example size for an Illustrator document? They don’t need to be too large, just viewable in the middle of the screen in reference to first-person.
In your material you can plug a TextureCoordinate node into your texture, from there it has UV tiling options. You can adjust those to change how much it tiles. If it’s set to 1.0 already, then most likely you would set U to 0.25 and V to 0.5
Otherwise you would need to adjust the UV mapping coordinates of the mesh.