Notes (text) and Other Stuff (image,video) can be published by users using client. The most popular on mobile are Amethyst & Plebstr (Android) & Damus (iOS)
Images and video aren't stored on a nostr relay, its stored by a separate file hosting service. The nostr relay only stores a url to the images and videos, and the client loads and renders the video or image inline with the text.
Thanks for the correction
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That doesn’t seem very censorship resistant if you’re pointing to a centralized file hosting service
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