While you could previously use assets from Creative Cloud libraries, you can now add assets such as colors, character styles, and components from XD to it as also organize the uploaded assets. The assets that you upload can be used across XD projects as also other applications such as Photoshop and Illustrator.
Working with CC libraries in Adobe XD is similar to working with them using other Creative Cloud applications such as Photoshop and Illustrator. For more info, and details on current limitations, see see https://helpx.adobe.com/xd/help/cc-libraries-xd.html

Current Limitations
Suggest improvements
There will be several enhancements to the experience in the year ahead, and it is just the beginning. To help the team prioritize requests, search for requests on your mind in this link https://adobexd.uservoice.com/ and upvote them. In case you do not find anything that is similar to what you want, feel free to create a request.
Feedback and questions
Reply to this post to share your feedback on this feature, and any questions you have around using it. Our team of experts here will do their best to assist you.