Hi, thanks for this plugin, very useful!
It would be great if the Dropbox App could be created only with access for one particular folder so that the blog authors find all photos at one place (you might have many authors who are not supposed to see the whole Dropbox).
Also, if the authorization didn't work because of a wrong setup it returns a warning: Invalid argument supplied for foreach() in .../wp-content/plugins/dropbox-photo-sideloader/dropbox-photo-sideloader.php on line 87 The array contains: ( [error] => Full Dropbox access attempt failed because this app is not configured to have full Dropbox access. Should your access type be app folder ('sandbox') instead? ). It would be good to have a button to delete the settings and start over again if Dropbox returns an error.