Man, I feel like I should already know this, but: on the iOS platform, how would one import or otherwise make available, NAM models (and other resources like IRs, reverbs, etc.) available for use? It’s really straightforward on Mac, but I’d like to start looking at the internal NAM plugin on iOS, and I can’t see how to do it.
This is a good question and something I wondered about too!
iOS/iPadOS use a sandboxed runtime which works differently than the non-sandboxed version of Mac.
On iOS I believe we do not have permission to retrieve a directory of files to show, whether NAMs, IRs, etc.. So all discovery of files must be based on Apple native iOS file selector dialog, so that native dialog is the nam file browser.
But whenever you select a file, MG also creates a bookmark for it, which it shows and persist for next session. So essentially you get a listing of all bookmarks that you have previously opened.
But there may be better ways to do this that im not aware of. Im curious if anybody have experience with another music app that does things differently.
I do notice that many apps (e.g. AUM, Cubasis) seem to have data folders in the OEM Files app under the “On My iPad” location, and some apps also seem to allow you to reach in to the “iCloud Drive” location (I remember doing this with Audiobus and QuantiLoop quite a bit). I have certainly transferred files between devices by dropping them in these kinds of folders before.
With the significant caveat that I am not an iOS developer 
, is there something that prevents MG from having such a data folder? (e.g., maybe because it’s TestFlight and not a regular App Store app?)