Multisite
Documents follow their host
A document lives in a field of its host record. On a multisite-enabled host, such as a Tailor entry, each site's record has its own document. The render cache is kept per site.
Per-block site restriction
A block can list the site ids it appears on (visibility.sites). There is no inspector picker yet; set it via import or the REST API. Imports map the ids by site code. The rule fails closed: a restricted block renders only when the active site is known and listed.
Templates and copy & paste across sites
Templates are shared by all sites; their text is inserted as-is, so translate it afterwards. Copied blocks can be pasted into another site's backend and get fresh ids.
Translating content
With AI configured, Translate… translates the text of the open document and shows the block changes before applying them. It cannot pull content from another site's version.