http://bfbzii56g2brpsg3a6hng45noo4lnby3ux5sgvpd53dyzpu3cre35ryd.onion/onion-upload-v3
It works by starting a web server directly on your computer and making it accessible as an unguessable Tor web address that others can load in Tor Browser to download files from you, or upload files to you. It doesn't require setting up a separate server, using a third party file-sharing service, or even logging into an account.