Loader and iOS

You can use loader and most possible way of loading audio, video etc in IOS and Android both. For IOS everything should be maintained (code) within the file where you'r compiling for IOS the external swf loaded will not be compiled so should not contain any script. IOS not support flash directly but you can do it from Android.

Also, make sure you include the files you are trying to load in the package when you build!

Try publish using CPU or Auto not GPU... and test, if you're using GPU don't need cacheAsBitmap (Matrix)

You should be able to load any Flash-supported file format on Android and iOS. The only exception is that you cannot load SWF files containing code on iOS.