[Spinningwoman]

If I understand you correctly, I’m using Calibre Sync for this on my iphone. There’s an option not to download covers which saves even more space which I use on my ancient iPad. . It is read only, but for indexing and downloading the books I want on the fly,it’s great. I keep my library in Dropbox to facilitate this, which is maybe not ideal, but as I only access Calibre on one computer and back up regularly, I’m content with it.