Maybe??? Not super excited.
Need to know if this is a pattern or not... Push button to go somewhere and get a file to attach, as with MMS. Or reference a person, as with address to send to. Still a field, usually, and you activate differently to cross-link, etc. Significant variation due to calling services on mobile; you can "attach" the camera, which opens the camera, then when done you select that photo and IT is attached. Maybe too far, and we drop this whole line item.
KEY PROBLEM: with it being a pattern, is that it's ingrained in the OS deeply. Not sure we can influence. Just stick in intro like radios and checks, so it's mentioned but not detailed?