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CMS Request: Sharing a CMS Collection Across Multiple Sites

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Currently, it is not possible to share a collection (database) from the CMS (Content Management System) between one site and another. 
An alternative is to copy and paste content between different collections.
Enterprise solution:
It is possible to share collections across sites with the enterprise solution. Contact our Enterprise team to learn more.
We are always working to update and improve our products, and your feedback is greatly appreciated.