Upon selecting Box as your data source, you will see the following login prompt:
Enter your login credentials and select "Authorize".
When working within Reveal, you will be able to use a wide variety of files:
Spreadsheets: Excel (.xls, .xlsx) or CSV, which you can use dynamically within Reveal.
Other files (including images or document files such as PDFs, texts, etc.), which will be displayed in a preview mode only.