Hi, @Vaughan_Curd. I do see this site using the Large Media add-on. In most cases, the issue is happening because those Git LFS files were uploaded to the original Git host (GitHub) but haven’t been sent to Large Media (which is the new Git LFS service now that the .lfsconfig file has been added to the repo).
This is only a best guess but if that is happening, you can upload the files to the Git LFS service with this:
git lfs push --all
and that should resolve the issue.
We have a support guide with more detail about this here:
It is possible something else is happening so if that doesn’t fix it, please let us know.