Using subdomian for WP image hosting only (not working)

Hey there, this is my first time posting here but I’ve spent the last few days pouring over forum posts to find my answer. I haven’t been able to figure this out so hopefully you can help!

I have a WP install at website.org

I only want to host the images and uploads at images.website.org

So I go into the settings/media area and change “store uploads in this folder” to: images

and “full URL path to files” to: https://images.website.org

as suggested here: https://www.techtipsgeek.com/host-images-wordpress-blog-subdomain-better-speed/6897/

However, when I go to upload an image nothing happens..the preview is blank. I’ll go and check the folder at images.website.org but see that nothing has been uploaded at all.

I’ve tried both the flash uploader and the html uploader, different folder names, different chmod values…but still no luck.

The tutorials mention nothing about editing the htaccess for getting it to work, just for google caching. I can post my htaccess code if it helps though.

Thanks in advance!