Gradients on libraries

Global colors, gradients, brushes and pattern swatches are not supported in CC libraries.

But as a workaround you can drag an object using a brush/pattern/gradient/global color to the CC Library 

You can also drag multiple items using different brushes/patterns/gradients/global colors together into a CC library to simulate a library.

The easiest way to add them to a new document is to hold down the Alt key when you drag them from the library and place them in a new document. The patterns/gradients/global colors automatically get added to your swatches panel.

You can hit escape before you click to place the object(s) or delete the dragged library items because the swatches and brushes are now part of the document.