import { AttachmentBuilder } from "discord.js"
import fs from "fs"

// ... other code

const myvideo = fs.readFileSync('/path/to/my/video.mp4');
message.channel.send({ content: "Here's the video:", files: [new AttachmentBuilder(myvideo, { name: 'video.mp4' })] });

// ...

import { AttachmentBuilder } from "discord.js"
import fs from "fs"

// ... other code

const myvideo = fs.readFileSync('/path/to/my/video.mp4');
message.channel.send({ content: "Here's the video:", files: [new AttachmentBuilder(myvideo, { name: 'video.mp4' })] });

// ...