It depends on the Client you are using. On Amethyst there is a button to add images or video. That will upload the content and link to it.
Nostr notes are similar to http where you need to link to the content. If you have content online already, you can probably just link to it like this:
I'm on primal, i can't upload all images from my gallery, and can't upload any video
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Does the Image button not work to upload 🤔
Image icon shows. only pictures icon, no video.
When clicking the icon only a few of my pictures are available. No videos are available to upload.
yes same