Ability to rename image file name once uploaded
Yup, missing this one, too. It would be good if Webstudio left names of uploaded assets unmodified. Currently, WS auto-creates a long suffix (screenshot 1).
I also run into limitations, due to the Style panel width. At less than the size of a stamp it becomes hard to tell images apart, visually. And one can't see the full image name either (screenshot 1). Showing a larger version on MouseOver might be a fast to implement improvement.
Maybe you could later introduce a larger, floating panel to let us work with images. I'd personally liked a large popover best (really large, would cover the full canvas) to handle all visual assets.
File names may play a role in in image-SEO. It would at some point be good to have a view mode that lets us see their full names, ideally along with their Alt-Text (screenshots 2, 3)
https://developers.google.com/search/docs/appearance/google-images