I removed all compositions and known files and re-uploaded it.
I could see the new preload file this time.
It’s working, some alignment issues, but that’s my problem.
For future readers I’ll mention that I had to access the upload setting via
My Sites->Network Admin->Sites->Click Edit next to your site->Settings Tab->Change upload folder from full path to just wp-content/uploads.
Thankfully it doesn’t appear to have broken anything.
The site is self hosted.
Thanks your help.
Now I just can work on making it prettier.
Regards