Explanation
The fn_get_audit_file, not dm_db_audit_file, the returns information from an audit file created by a server audit in SQL Server.
This example reads from a file that is named
ShiraServer/MayaDB/SqlDbAuditing_Audit/2017-07-14/10_45_22_173_1.xel:
SELECT * FROM sys.fn_get_audit_file
('https://mystorage.blob.core.windows.net/sqldbauditlogs/ShiraServer/MayaDB/SqlDbAuditing_Audit/2017-07-1 Note: Blob auditing logs are saved as a collection of blob files within a container named sqldbauditlogs.
References:
https://docs.microsoft.com/en-us/sql/relational-databases/system-functions/sys-fn-get-audit-file-transact-sql