Docs for creating a ghost storage adapter

I am running a self-hosted ghost instance (latest). I want to make my app stateless for which I was trying to add cloudinary to my app. I used integration provided by ghost (at Official Ghost + Cloudinary Integration). While writing a post I realized that this module only uploading images to cloudinary. But the video, pdf and other files are still getting uploaded to local file system, which is bad if i wanna run multiple instances of ghost and scale horizotally. So, I decided to go and creating our own custom storage adapter. But I was unable to find the docs for creating a custom adapter.
Any help is appriciated.

Just so you’re aware, this is not currently supported

Ok Fine, but I want to make my app stateless.

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Storage adapter docs:

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