This action invokes the generic Share dialog on iOS and Android. That, in turn, causes a list of relevant apps to appear which lets the user decide how they want to share a particular piece of content.
Share Dialog Tutorial
The primary string describing the item to be shared or the shared item itself. This could be arbitrary text, a URL or other identifier.
Additional text describing the item being shared.
The text that will appear at the top of the share dialog.
|From Image Block||
When a local image is shared, the Custom Block containing that image. This would go in the email's body, as an MMS or to Social Media.
For reporting, this value will associated with the event that tracks sharing.