I recently rediscovered the App Documents 5. I tried out this app a year or so ago and it got lost in the shuffle of all of my other apps. Documents 5 got a recent update that added some amazing features that will allow you to view common file formats, annotate PDFs and create text files. You can view Office files, PDFs, images, videos and much more. Documents features fast and reliable PDF viewing experience. It allows you to highlight, strike-out and underline text within a PDF document.
Documents allows you to get files from your computer, sync with Dropbox, iCloud, other cloud services and any source you can imagine. You can also download files from the Web using built-in browser. Documents allows you to organize your files into folders with its own file manager.
Documents also has a built-in media player that allows you to access your media files. Simply copy or download movies, music and photos into Documents and enjoy. It is super fast and super easy to use. Documents 5 is made by Readdle. They also have other apps to help you be more productive on the go.