How to send a file in a url via curl?

I have an image in a URL like https://i.postimg.cc/GpDskmSG/sdssds.png and I want to send it over to be stored at nft.storage. Could I send it directly as a URL instead of a file from a path? I tried the below but it only stores the image URL.

curl -H "Authorization: Bearer eyJhbGciOiJIwetertyrtyUzI1NiIsInR5cCI6Ikp" -H "Content-Type: image/png" --data "https://i.postimg.cc/GpDskmSG/sdssds.png" --url "https://api.nft.storage/upload"

P/S: I'm testing on windows curl.