It looks like this might not use stable memory yet 
So you’ll likely be limited to the heap memory, for a website of only a few gb that might be fine. But for larger file storage purposes you might want to opt for something else.
Maybe the following project might be an alternative: Improving the Stable-FS: Enhancements and Optimizations for Better Performance
Keep in mind this does not implement chunk uploading and http_request so you’ll need to combine both projects manually.