When it comes to videos:

How many MB can I upload max or how many minutes?

There are "NIP-96" servers and "Blossom Servers" and "Built-in media servers " - I m referring to Amethyst setup for example - is there any guide what to use and how? What each server of all those do differently? Does it matter who owns them?

There are a lot of paid "services", nostr.build, nostr.wine etc. Subscribing to them does it make any difference in the experience of accessing nostr clients? You can upload more and lengthy content if you subscribe to nostr.build for example or does it serve only as a cloud to store your content?

I m mostly use primal (because it's easier) but when I m giving a "thumbs up" on Amethyst, this doesn't appear on Primal, so when I give 👍 from Primal, the note in Amethyst has 2 👍, from me. I don't get that.

Well there are some of my questions. 😅

I don't like to overload.