I am building a simple contact form (non-admin) that has an attachment field. Of course I can just handle the upload via WP's wp_handle_upload function. However, I would like to give my visitors a more user friendly experience and manage the upload via wp's media upload "pop-up". Offering them upload progress feedback, drag'n drop etc. I know that this is normally admin only but is there a way to use this upload dialog for normal (non-registered, non-logged in) users?
I'm quite amazed that apparently no one really did this (after quite some searching).