Is this actually still possible?
Despite the full editor still having the "Manage Attachments'' button, and above the button it says
Valid file extensions: doc docx gif jpe jpeg jpg pdf png ppt pptx xls xlsx
yet my attempts to upload a PDF failed; the paper clip icon in the toolbar, the picture icon, and the Manage Attachments button all produce the same upload dialog, and upon selecting a PDF file and clicking Upload, a new error dialog pops up saying "This AI image has the incorrect file extension."
In mobile skin the picture editor does not have a paper clip icon, but the image upload icon has a similar result, "Your file (name) oculd not be uploaded. It is not an accepted file type."