The Paperpile extension for Chrome provides easy access to your account and quickly stores sources using the URL of the page or directly from the search engine results page. The extension also provides a link to access the settings for your account and the Paperpile app where you can organize and manage your sources.
The Paperpile addon make inserting a citation into your Google document very easy. Just choose 'Insert citation' from the Paperpile menu, search your sources, and click the source to add the citation at the current cursor position. The 'Format citations' command will make sure the format matches your chosen style and add the source to your list of references.
This link is the Paperpile help page provided by the creator of the app.