Can't upload

Hi,

When I try to upload a file, the plugin redirects me to a 404 address. I’ve tried includind a success page, but it doesn’t seem to work. Could anyone help me out?

Here is the page:

http://shootingbeauty.co.uk/mytrueselfie.com/

Thank you very much and have a great day.

https://wordpress.org/plugins/frontend-uploader/