The app integrates with a single Azure Blob Storage Account at a time.
However, one can choose to connect different Azure Blob Storage Accounts at different points in time and migrate files to them.
P.S. Discover Azure Integration, the easy way to upload files from any Salesforce record to Azure. Find it on AppExchange: https://appexchange.salesforce.com/appxListingDetail?listingId=c9e71bd6-5bab-4182-a461-b82d4f971183