If you run the flow in the cloud, it'll need some place to persist it so I've chosen Google Drive to start. If there's enough demand, I'd be open to storing it on Browserflow's servers and providing an API to access the files but I'd want to make sure that's something enough customers want before sinking my time into it.
I'm not (yet) a Browserflow user, but it's something that I'm going to either pitch or just skunk into my workflow. But when that time comes, I will absolutely need a first-party way to download screenshots. I'd be open to pulling them from an S3 bucket, but absolutely not from Google Drive.
That time is at least a few weeks off, though, probably after the new year.
Take a look at the "Take Screenshot" command and feel free to message me on the Browserflow Discord if you need help.