Just need to choose the correct client

Gifbuddy.lol

i typically paste the url of the gif from tenor.com or something some clients, like damus and yakihonne, will let you upload a gif from your device. :3

you can host the gif yourself, host it somewhere or post a link to someone else's.

Download the GIF, upload to nostr:npub1nxy4qpqnld6kmpphjykvx2lqwvxmuxluddwjamm4nc29ds3elyzsm5avr7 , copy the link from nostr:npub1nxy4qpqnld6kmpphjykvx2lqwvxmuxluddwjamm4nc29ds3elyzsm5avr7 , paste on nostr https://i.nostr.build/wqwy8v1pjEnDDxTx.gif

In amethyst, add it as an image from your gallery after you download it from somewhere. The icon on the left here... https://tamby.mjex.me/6296c76824aafd08284f811a1a462f3974f1e5f52326cc3642d2b94fa02ab65b.jpg

I use nostr:nprofile1qqstuu6ccnl9q9yvejhuqt4zqhvqz30z2wyf4gu43k404p3hq37ggrspzpmhxue69uhkummnw3ezumrpdejqz9rhwden5te0wfjkccte9ejxzmt4wvhxjmccqes28's https://www.gifbuddy.lol/ https://media.tenor.com/fRRCoOZLU4YAAAAC/noice.gif

Copy paste

In amethyst you can start typing : and then click resize on the right side Just like this https://media.tenor.com/zt8A1uJdny4AAAAd/backpack-kid-backpack-kid-dance.gif

gifbuddy.lol

Yakihonne has .gifs