giacomolaw

The Newspaper and Newsmag themes do not support the modal when using a CDN. This plugin works around that, and allows you to use the modal whilst using a subdomain, or different domain, to serve your images.
Also works if you use domain sharding.
You can contribute and view the code here: https://github.com/GiacomoLaw/cdn-modal-enabler/

CDN Modal Enabler

Enable the modal image when using a CDN in the tagDiv Newspaper theme - switch off global modal image in settings.

Taylor Lovett

This WordPress plugin proxies all images and videos on a page through <a href="https://cloudinary.com/" rel="nofollow ugc">Cloudinary</a>. It uses <a href="https://cloudinary.com/documentation/fetch_remote_images#auto_upload_remote_resources" rel="nofollow ugc">Cloudinary auto-upload</a> functionality so Cloudinary uploads and serves images on the fly. This means you don’t have to upload anything to Cloudinary. Everything just works out of the box. Cloudinary also provides a powerful transformation API so you can modify and optimize images on the fly. 
Pull requests are welcome on <a href="https://github.com/tlovett1/dynamic-cloudinary" rel="nofollow ugc">Github</a>.
Note: This plugin requires a <a href="https://cloudinary.com/" rel="nofollow ugc">Cloudinary</a> account to serve images. Please refer to Cloudinary <a href="https://cloudinary.com/tos" rel="nofollow ugc">terms of service</a> and <a href="https://cloudinary.com/privacy" rel="nofollow ugc">privacy policy</a>.
<h3>Support</h3>
For full documentation, questions, feature requests, and support concerning the Dynamic Cloudinary plugin, please refer to <a href="http://github.com/tlovett1/dynamic-cloudinary" rel="nofollow ugc">Github</a>.

Dynamic Cloudinary

Automatically serve all your images optimized from the cloud.

CDN Modal Enabler vs Dynamic Cloudinary