Submit with OBB

So, that file will be too big to submit to the Gear VR store. The max is 500MB for the whole application. What you can do, is allow the core app to download additional files from inside the application. However, while acceptable technically, a 1.5GB download may still be a lot for many mobile users. I'd also consider seeing if streaming is an option for you (although obviously more costly and complex).

The Felix and Paul applications do this as well. Nomads has you download 3 seperate video's, each ranging from 1gb to 1.6bg. 

Something to consider, there is already a use case for doing it.

I didn't think there was a size limit. At least, I remember downloading Guided Meditation which was over 500MB in the initial download.

Separate download and streaming certainly are options, but that sounds like a costly download. Does anyone know what the cheapest service is for storing and the bandwidth for downloads for really large files?

Amazon Web Services' S3 is one option, though depending on what you want to do, you might need someone with backend experience. If you just want to use AWS as storage for people to download files, it's fairly easy to set up (Amazon even has Unity plugin support as well). How much bandwidth you have access to depends on your plan.