Comments synchronization options are part of contract configuration, you can set up comments properties in Contract→Triggers section:
Permissions to External Comments Tab
Permission's can be set globally in general configuration:
It affects visibility of 'External Comments' tab on issue. No group selected means no restriction.
|External Comments Tab active in one JIRA only|
|External Comments Tab active in both JIRAs|
External Comments inactive in botj JIRAs
Only comments synchronization flag enabled:
Attachments synchronization option available on Contract→Triggers section:
|Enables attachments synchronization.|
- Synchronize all attachments
Similar to "All comments synchronization" described in this chapter.
Synchronize all attachments in later stage of remote issue creation.
- Remote issue prefix for attachments
|Adds remote issue id to attachment name.|