One of the icons on the toolbar is for "insert photo". You can link to whatever site your photo is stored on using that tool. The photos on my recent
Rome trip report are linked to my smugmug site, for instance. I'm able to select the photo size as part of the link (small, med, large, original).
Would be nice is we had a test area here on FT so folks could play with these features.
Here, for instance, is a photo with the small setting, then medium, and then large, all set from smugmug.