PostgreSQL for user management and another database for file management (Blob storage)

I am working on a project with video hosting and online editing platform with a microservice architecture in mind. One of my teammates uses PostgreSQL SQL for user management, but I need to handle large files, and we are going to use Azure blob storage. I would like to know, should I create another database for file management, and if yes, what should it be? (I have MongoDB in mind)