How to upload a file from a URL as multipart/form-data in Postman

I have an API endpoint that accepts multipart/form-data file upload. I managed to upload a local file to it with Postman using the File option as below:

Now how can I upload a file that is hosted at a given URL using Postman without manually downloading it and then selecting its filename as in the above screenshot? I'm hoping to somehow GET the URL, store the binary data, and upload to the endpoint, all within a Postman collection.