However, I’m running into some problems that I don’t know how to solve…
No problem to change the upload_url_path in Wordpress Admin.
Media Library showing the new path immediately.
I duplicated all pictures on images.example.com, and would now expect that the media library shows them.
Unfortunately, no joy.
I tried to upload new images. Again… no joy. The upload looks ‘normal’, Wordpress needs some time, but I cannot find the uploaded images anywhere, not in Wordpress uploads, nor on the subdomain.
I guess that there may be something I have missed with the A record or the CNAME record, or the .htaccess file, or something else… I do not know.
Any help you can provide would be gratefully appreciated.