This is a very simple flask app that allows you to upload your files, I needed this app multple time when I have a machine that doesn't have the needed commands to open an http server to serve files, or in the case that it doesn't the permissions to touch or open ports. To resolve this problem, I host this application in my machine then go to the other one and upload the files, without any serving or opening http server.
Here's the curl command to upload multiple files:
curl -X POST http://127.0.0.1:5000/upload -F 'files=@file1' -F 'files=@file2'