The document provides instructions for using the ES File Explorer app to manage files on local and cloud storage as well as connect to network attached storage devices like Thecus NAS. It describes how to download and install the app, connect to a Thecus NAS via FTP, and gives steps for uploading, downloading, sharing, and deleting files. Functions covered include managing files on local, shared, FTP, cloud services like Dropbox and Google Drive, and sharing files to social networks.