All Office Document Reader is the best app for reading all types of documents on your Android device. It supports all the major formats, including Word, Excel, PDF, Powerpoint, and many more. You can even open files from other apps on your device, and view them in full-screen mode.

You can easily view all the files on your device, and sort them by type or date. You can even add a category to help you find them more easily. The app will also show you the most recent file you have downloaded, so you won't have to worry about downloading the file again.

If you need to make some notes about a particular document, you can easily do that with the built-in annotation tool. You can choose to add a title, comments, and keywords to help you remember the document better. The app also has a built-in search tool that will help you find a particular document faster.