Box (formerly known as Box.net) is an online file sharing service.
Podio is integrated with Box to let you link to your files from Box to Podio.
Here's how you connect Box to Podio:
Click to add a file in Podio. This could be the paperclip icon in statuses, the "Add files" button in items or the "Attach files" button in tasks.
Click "Add file service" and choose Box.
Connect your Box account by signing in to Box, and then you can browse your Box files on Podio.