Which icon on the reviewing toolbar should you click to insert document?

To insert a document using the reviewing toolbar, you should click on the "Insert Comment" icon, which typically looks like a speech bubble or a note. However, if you are looking to insert a file or an object, you might need to navigate to the "Insert" tab in the main toolbar instead, where you can find options for adding documents or objects. Ensure you're in the correct mode to access these features.