Sadly the web clipper is something that always breaks in some way to make the saved page unusable and even the screen shot feature (which should be simple enough I guess) breaks as in: Web Clipper Screenshot function is buggy . It’s particularly bad as I’d like to replace Pocket.
To be on topic a nice feature is that like is that you can add (small) files to Joplin, beside the normal notes, as it was said you can basically include anything.