asset bundle cache internet download

Hi,

I would like to reduce the size of my initial build by moving the sounds to the internet. I noticed that I can put the url in the sound directly which is very cool!!!

I was wondering if the sound is download and cached so that if their is no internet connection next time the user plays the game, will the sound already be downloaded and available to be played?
or does it need to be downloaded every time the game is run?

In a similar vein, Unity asset bundles use LoadFromCacheOrDownload which would download it once and cache it and I was wondering if you have any examples or preferred methods for putting the audio files in an asset bundle and then downloading them using LoadFromCacheOrDownload
and then linking them to the appropriate place in Master Audio? Would I simply put the audio prefab in the asset bundle with the links to the audio files in the asset bundle and then when I instantiate the asset bundle all the files will be ready to be played?

Any help in the best direction to accomplish this would be much appreciated.

Thanks