Initial Sync
After installation the app needs to sync your current issue comments to capture the initial state. This might take a while depending on how many issue comments there are.
You can always retrigger this process manually later, but there is usually no need to.
The progress of a sync process currently running is shown directly on a issue panel or in the configuration section.

Limitations
Issues with over 1,000 comments cannot be synchronized during the initial sync. As a result, the timeline of a comment may not be accurately reflected.