Add them to an Album as one of your media pages, then link that here. It work nice that way.
I'm going to move mine over to that from. I have quite a lot to put up too.
(I'll delete this when they are up)
Ah, I can do PNG or JPG buried in the setting somewhere. Which is useful as I can then edit them a bit. Though we have new ones now and they seem more restrictive.
This website then recompresses them to .webp files.
Thanks for that, I will look into getting it uploaded to the Archive. Much better if you can upload them there, or here as images so we can add them instead of the Media section.