GitHub’s upload dialog has a handy placeholder in the editor while your upload is being processed:
In Discourse I tend to take my fingers off the keyboard as long as I’m downloading something, because the download link will be inserted wherever my cursor is at the time.
Sure, not a bad idea, up to @zogstrip. If it is hard may need to wait for a future release.
Just pushed the upload placeholder 
https://github.com/discourse/discourse/commit/38cb72b3294230caee2ab7f11b8f90c43b68969d
Fantastic!
Funnily enough I think your server was running an update of sorts just now, because my first test pic uploaded perfectly, but then the updates were constantly stalling, both here and on Try (page loads were also slow, so I’m pretty sure it was server). Perfectly fine and snappy again now.
Because I happened to experience a longer than usual loading time, I did notice a few minor quirks, but both might be quite hard to do anything about:
Kind of edge case, but I noticed that if you’re typing something above the placeholder, your typing position will be forced to the end of the placeholder when it finishes. Like:
I'm typing something above this image and sudd
<img src="//assets-meta-cdck-prod-meta.s3.dualstack.us-west-1.amazonaws.com/original/3X/8/8/889493f5d072349533b284ba007ec0384f0cc2a2.jpg" width="690" height="215"> enly it's continued here.
That’s now fixed with
This is now fixed 