Azure storage account pricing for using Azure file storage

Hi All,

I have a certificate file which I want to access it through code, in 2012 it was stored locally.

We are upgrading to ax 365 ,to access the file can I use azure storage (Files) and use the url in my code to access the certificate. 

Another question is the azure storage account does it come with the default azure subscription if a customer is moving to ax 365 or he has to pay additionally for using azure storage.