Hi @punkch! This feature is on the roadmap, and we believe that moving blobs out of the database would have several benefits. However, we also think that implementing this feature would be a large effort, requiring changes not just to the API server, but also to the frontend and our Docker setup. We're working hard on the upcoming v1.4 release and don't currently have the capacity to provide guidance about this feature or to review a PR. That said, we are interested in adding this at some point, so please feel free to check back about this feature in the future. We'd also be interested to hear from others who would find this feature useful.
Also on the roadmap is a separate (though perhaps related) feature about expanding access to Form Attachments and Submission Attachments. For example, see: