Ask HN: How to sell cloud storage for my app?

I have a simple video editing tool that runs in the browser that I’m trying to monetize. We have around 10K MAU and it is currently ad supported. But I am simply not making enough money to support the product sustainably.

One idea is to let subscribers save their videos and assets in the cloud. Seems to be a common strategy for such tools. How may one implement this? Should I just put their files in S3 and call it a day?