So, yeah, I think you just need to use the edit/add image on top not the add photo on the bottom!
In fact, that last image? Tried it from the add photo and insert image. Worked on the second, but not the first, so as long as you can find the URL from where you got your GIFs, your set!
I can't find the Arcee beating the crap out of Starscream GIF, but I don't think I used that one that often anyway!