it's not a nostr issue, this is a nostr.build issue. if you read what i said, you would see that i said two different times that this is something that nostr.build should look into adding for users. i agree that nostr and adjacent services can do a lot to help user experiences.

It is Nostr issue, yes. We are constrained by the sha256 requirements for uploaded content. This means that once you upload something, we cannot change a single bit of that file. Handbrake is a good software that will allow you to produce shareable media.