Try out sharry. Sharry is a self-hosted file sharing web application.

It works pretty well for my use cases. I also like the alias feature, what is pretty much what you are searching for. The only thing I miss, is the possibility to download a share as a zip folder. But there is an open issue for it, so maybe it will be added in future (again).

No legal info. At least they had to provide their full company name, address amd comtact. It’s also pretty likely, that they add their terms and conditions and your right of withdrawal.

Bitwarden has a cli tool which I find pretty useful. Together with jq you can even pipe the password or store it to a variable.

You can have Pandoc and Git with Obsidian (https://obsidian.md/). Both as Plugins. Or even with VS Code. Obsidian sadly isn’t open source.