To sync the Tasks list with Project you simply open a linked project file and run the BrightWork Macro.
Note: If you are using Internet Explorer, you must add your site to your browsers Trusted Sites list to sync correctly. See this BrightWork support article for more information.
Tip! The Sync runs every time you click Save. Therefore, if you want to do any kind of 'what if' analysis, you probably should not click Save when doing so.
To ensure the data returned by the Project reports is accurate, you should Recalculate the Metrics list every time you do a sync.
If you are using Microsoft Project Click to Run to Sync Tasks on a SharePoint 2013 server, you may encounter an error saying 'Project cannot access ...'.
This is normally related to a Setting in the Office Document Cache which can be updated as follows:
Alternatively you can install Microsoft Project Professional 2013, though you should not need to.