Allow webp image uploading:
This is a HUGE problem. Most of the images I download online are webp which I then have to use another tool to convert to png or jpg just so I can upload them.
Allow image pasting:
If the above for some reason is not possible, image pasting is also a good option to skip the downloading process altogether (I'm sure some people's computer storage is full enough already)

dupe. although the pasting pics is a good suggestion.