The Notero plugin collects only the data necessary to synchronize with Notion; specifically, this includes the user's Notion integration token and database ID. These values are stored on the user's local computer alongside Zotero's other preferences within the Zotero profile directory. These values are transmitted to Notion for purposes of synchronization. They are not transmitted anywhere else.
As part of the synchronization process, user-generated Zotero item data may be transmitted to Notion. These may include but are not limited to: notes, tags, and custom fields. Data saved in Notion is subject to Notion Terms and Privacy.
The Notero plugin does not communicate with any services other than Notion.