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It sounds like you’re describing Home Assistant? HA has a ton of integrations into a lot of self-hosted services not just IoT devices.

I use Pingvin. You upload a file to it and it generates a link. Has expiration on the link.

You can allow anonymous uploads or not, give friends logins etc.

I have it locked down to just me with a login and I use it to let others download the files.

I have one where I put a door/window sensor on a window and anytime that window is opened it turns off the HVAC, then when closed, turns it back on.

I tried once to setup a notification to open the windows if the weather was nice, but I’d never gotten to work quite like I wanted, and so I turned it off.