CODE EXAMPLE FOR PYTHON

discord.py send image from url

import io
import aiohttp

async with aiohttp.ClientSession() as session:
    async with session.get(my_url) as resp:
        if resp.status != 200:
            return await channel.send('Could not download file...')
        data = io.BytesIO(await resp.read())
        await channel.send(file=discord.File(data, 'cool_image.png'))