Here's a detailed video guide on using rollApp. The video is created by Going Mainstream with Linux, a YouTube channel designed to educate people on the merits of using Linux in their daily lives.
"Good news for Chromebook and Tablet users. You can now access free Linux apps like LibreOffice via a Cloud provider to work on documents, images and play games. In this example, I show you how to create and revise a spreadsheet locally and on-line using the website: www.rollapp.com."
I like the video in this article very much because it gives me most of the information about the cloud storage which is such a helpful for home and business user.