How about an easier way send Attachments in a canvas app to a SharePoint List and "recalling" those attachments as well?
Example: We have a "ticketing" app. The user fills out a bunch of fields and we Patch the information back to the SharePoint List as a new item. When they want to view/edit their ticket, there's another screen with a Gallery > they select their item in the list > click a button > taken to another screen (duplicate of the "new ticket" screen) and we use the Defaults parameter to pull the information for their ticket (and variables). I want to be able to allow them to add attachments in the new ticket screen and be able to view/edit/upload attachments in the view/edit ticket screen.