For each iModel Connection there is a corresponding "Sync Report" that is produced after each run.  The Status of the last run connection is shown at the bottom of the iModel tile.

Clicking on the "View Report" link will take the user to the Connections page.  For Connections with multiple files the user can expand the run results and view the status messages of individual files.

Viewing the Sync Report for an entry with warnings or errors can be done by selecting the "More." link under details, or by clicking the 3-dot menu on the right side and selecting "Sync report".

The initial Sync Report will show the status of the overall connection run, not just the file that the user selected.

 

Selecting the Details tab shows specific category issues (Reference, Business Properties, etc.) for each file.

Detailed message text can be read by hovering over the information icon  on the right side of the report.