Error:
I created a document library in SharePoint 2013 site and I was trying to add the Report Server related content types, but I was not able to see those content types.
Resolution:
We need to activate the site collection feature – “Report Server Integration Feature”.
Navigate to the SharePoint 2013 site. Click on Settings icon. Click on Site Settings. Go to Site Collection Administration section and then click on Site collection features.
Search for Report Server Integration Feature, click on Activate button. (Note: If the feature is already activated, try to deactivate and activate again.)
Navigate to the document library and now one should be able to add the report server related content types.