After uploading you will be redirected to yourfile.txt. Make sure to save the link if you're encrypting. You can change .txt to any valid MIME type to display it in the browser.
curl -Ls -o /dev/null -w %{url_effective} -F upload=@- https://pastebin.seanbehan.ca
curl -Ls -o /dev/null -w %{url_effective} -F upload=@- https://pastebin.seanbehan.ca/encrypt
encryption: