Acrolinx checks files in a SharePoint library.
What You Can Check
Acrolinx for SharePoint can check files in a SharePoint library.
You'll only get meaningful results for file types that are supported by your Acrolinx Platform. To see a full list of supported file and input types, see the article Supported Input Types in the Core Platform documentation.
Your Acrolinx administrator can also extend the file extensions that Acrolinx can recognize. See the article How to Configure Acrolinx to Recognize Your File Type to learn more.