Activate the report server file sync feature in SharePoint
Applies to: 
SQL Server 2016 (13.x) Reporting Services and later
SharePoint ❌ Power BI Report Server
The Reporting Services Report Server File Sync feature utilizes SharePoint event handlers to synchronize the report server catalog with items in document libraries. This feature is beneficial when users frequently upload published report items directly to SharePoint document libraries. If the file Sync feature isn't activated, content still synchronizes but not as frequently.
Note
Reporting Services integration with SharePoint is no longer available after SQL Server 2016.
The File Sync feature can be activated in SharePoint Site Administration after you install the SQL Server 2016 (13.x) Reporting Services or later (SSRS) Add-in for SharePoint products.
This feature can be manually activated and deactivated per site but not at the site collection level.
Prerequisites
The Reporting Services Add-in for SharePoint must be installed. If the add-in isn't installed, the file sync feature won't be visible in the site feature list.
To verify installation, view the list of installed applications in Microsoft Windows Control Panel. If the Reporting Services Add-in is installed, follow the instructions in this article to activate the report server file sync feature.
To activate or deactivate the Reporting Services file sync feature on a site
From the main page of your site, select the Site Actions menu and select Site Settings.
In the Site Actions, select Manage Site Features.
Find Report Server File Sync in the list.
Select Activate.
Note
To deactivate the Report Server file sync feature, you can use the same procedure but select Deactivate.