You can collect intended use in portals when users download or share assets. They may also need to agree to your site's policy and terms before downloading or sharing.
Intended use for portals can be enabled on the Features page in the Admin app. There are two feature settings for this, and the one you enable depends on the access level you set for your portal in Share settings.
For portals that have security set to Public or Access code, the Collect Intended Use on External Collections feature needs to be enabled for intended use to show. Users will enter their email address and select what they're using the file for before they can download or share. By default, the intended use field is blank the first time users select a use. Once they select a use, the field defaults to the one selected until they update it.
For portals set to Require login (both limited and extended), enable the Collect Intended Use Within Site feature. Users will select what they're using the file for before they can download or share, but don't need to enter their email address.
After saving their intended use, users can update their intended use by clicking Change.