Some further musings. I’ve managed to get the not working site to work by substituting the store and URL paths in media settings for those used on the working site (didn’t seem to work before – user error I guess). So now everything is uploaded to the working site’s store directory and the direct URL of items hangs off the working site’s domain name.
It works but obviously it’s a bit of a bodge I’d rather fix.
Btw as you might have worked out I’m using my own path for media storage rather than the WordPress default.
