Just posted an image to a site and note that there's no way to add descriptive alt text, which would be wonderful for meeting accessibility commitments.

My image has been posted with a generic alt text value saying it's an image 'of' the site, but it in no way describes the content of the image, which is critical for the visually impaired to make sense of the content. I often find reading alt text helps me find things I didn't even know where in the image from a first glance, so it's a win-win for everyone.

It'd be great if this feature could be added, and - dare I say - offered with some guidance on how to write good alt text.

(PS love the way 'start typing your reply...' turns to 'keep going' as you type)