The Perspectium DataSync Free requires, at a minimum, read access to the Attachment Document table. Modifying the table access will allow attachments to be sent when sharing records.
Prerequisites
First, you will need to install the Perspectium DataSync Free application.
Procedure
To modify table access, follow these steps:
Navigate to the Attachment Document record
In ServiceNow's left side navigation window, navigate to System Definitions > Tables. Filter the table by searching for the label Attachment Document and click the record.
Add access to application scopes
Navigate to the Application Access tab. Please ensure this table is accessible from All application scopes. Then, click the Can read checkbox and Update the record.