We no longercurrently don't have an explicit entry point for this, but you can paste an image link when the uploader UX is showing. There was a focus bug in Chrome that made it fail. That is now fixed.
The same bug still exists in Edge, but if you click somewhere on the dialog, then it will work. We are working on a fix.
Once that is fixed we will updatebe updating the UI textexperience to: add an explicit link to upload via URL. That is coming soon.
Drag & drop, paste or click here to upload an image (max 2 MB)