Users can access and store files in Box from Salesforce on the Account, Contact, or Case level.

Accessing Account, Contact and Case Files

Account Files - On the account page layout, there is a tab for Files. This tab is used for storage of Box documents that are viewable by all departments
Contact Files - On the contact page layout, there is a tab for files. This tab is for storage of Box documents that are viewable by all departments.
Case Files - On the case page layout, there is a tab for files. Files stored on the Case page will only be visible to others within your department who also have access to the case.      NOTE: Files uploaded to a case are private, they are able to be accessed only by others in your department with the same access permissions.

Uploading Files - To upload files click the plus button on the top right of the Box component.  

Downloading or Making Changes to Files - To download files, click the ellipsis to the right of a file for more options, then click download.  In this area you can also:

1. Open the file in the desktop application
2. Replace the current version by uploading a new version
3. Move or Copy the file to a new location
4. Classify the file
5. Lock the file