Updates to Add Media button

[rapuckett]

"Clicking + button should take people to their camera roll - if we are giving options, we need three: one needs to be camera roll, camera, and “other media” that lets them pick from other apps. We used to do the “other media” when you did a long press.
Long-press should allow users to import media from ANY media type (audio, pdf, etc.) from any app on their phone - this was in the OG designs and needs to be in the onboarding instructions and implemented as the long press isn’t working
Requirement unclear - let's clarify exactly what needs to happen here please. i will show you what this means, we need people to be able to do long press to access media from other apps on the phone (like voice notes/audio, pdfs etc) i've explained this (and showed it) many times, it works on ios, so i'll send you a video"