When my boss got all excited about "the cloud" I asked if he wanted public or private - of course the word private got his attention. So I said how about this:
Host it here for speed, and at one of the regional offices for redundancy.
Good idea he said.
We already do that I said.
That's not what you think it is
Well it's an SMB file system designed to be shared storage for VMs running in Azure. It's not designed to be accessed via Azure Virtual Network and browsed from on-premise over the Internet. The OP was talking about running SMB over the internet.