Link an Image for profile picture?

“Sorry, that file is too big (maximum size is 3072kb). Why not upload your large file to a cloud sharing service, then share the link?” I get this message when trying to upload an image but my only option is to select a file that’s already on my computer. How do I share the link?

This should put this as a question topic instead of site feedback. Peoplel will probably answer there. BTW, I don’t know what to do.