I'd like to share a bunch of PLR background and hero images with my subsites, in an ideal world they'd be hosted offsite and served by CDN.
Unfortunately Network Shared Media shares ALL sites media instead of specific sites and I can't figure out how to hack the php to insert target blog ID/s. I'm using S3 and Cloudfront (WP Offload S3) with EWWW Optimizer which works great auto uploading images seemlessly with the WP Media Library using cloudfront url.
Cloudinary Media Library was a good option, but they use an iframe for Admin and the media library includes a Delete button with bulk delete coming soon, and you just know someone will delete everything either on purpose or by accident.
I looked at some Flickr remote media library options but they were either unsupported or limit the number of images until they release high-priced version. I like the Flickr idea but can't find a working plugin.
I tried Sirv.com which wasn't terrible for images for posts but it wasn't exactly right for this purpose.
you'd think there would be a decent, secure way to share images on a multisite.