YoutubeDL-Material is exactly what you're looking for. It does both, either download to the machine accessing the software in the browser, or download to a location on the server. Best of both worlds. It's actually a great bit of software, does more than you expect.

We have many apps that are used daily and improve our lives, the family wiki is trillium, family photos on Photoprism, NAS storage for each person for their documents etc. navidrome for music, various for media consumption, oobabooga for a private chatgpt, automatic1111s stable diffusion UI for graphic design. Some finance logging tools I wrote to manage our finances. A series of cameras viewable that cover the house. Tasmota on dozens on smart plugs/lights/sensors etc. a zigbee network for door monitoring. Pihole. Homer as the dashboard to reach everything. Plus various others. For me it’s the golden age of self hosting, so many mature products now. I’m also pretty ruthless, if there’s something we don’t use it’s deleted.

Homer - as your dashboard with links to everything you host. My wife has it bookmarked and from there can access anything else we host.