I solved this problem by bundling sound files (in my case SoundFonts) in Xcode 
with the Audio Unit App Extension target. This way both the app and the AU 
extension can access these soundfiles.
In your case I believe you want to play sound files imported at runtime with 
your AU app extension. Have you tried to move these files to the AU app 
extension bundle, say, its Documents folder?


> Am 08.02.2018 um 16:21 schrieb Vieira Damiani, Luis F <dami...@ufl.edu>:
> All the above seem to be meant for macOS only, and apparently the temporary 
> exceptions are gone with Sierra. So is there any hope for an iOS AUv3 to 
> access files from its own sandbox? I am not even asking for the ubiquity 
> container, or network access, which would be great, but how is this such a 
> tremendous threat that one cannot load a simple audio file the user specifies 
> into an application whose sole purpose is to make music?
> Any help would be greatly appreciated!

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