How can I update my Dawn checkout logo successfully?

Hi I’m using Dawn and I’ve just tried to update the look of my checkout and this message is coming up:

Failed to load the page:## This page is not compatible with the editor due to one of the following issues:

  • Page is redirecting to an unsupported URL
  • Page failed to load due to an error

Can you please

Can you please advise what I can do about this?