To configure 3rd Party Viewing of Layouts
Setup the user and the role...
Top menu --> Users --> Staff roles --> + Add a guest role
Role: Custom Layout User
Top menu --> Users --> Staff users --> + Add a staff user
Press + Custom Layout User
First Name: Subscriber Name (Acme)
Last Name: Custom Layout
Make sure there are no spaces in the username.
Select Manual password
Leave the Password as it is
To configure each process...
Top menu --> Setup --> <target process> --> Template tab --> Security
Add a role or group: Custom Layout User
Set the "Custom Layout User" to "Start only, hide all"
Verify the setup...
Top menu --> Setup --> <target process> --> Template tab --> Guest user logon + start links
The new acmecustomlayout user should show in the table
To share a specfic layout...
Got the Set Menu for the process and click on the layout you want to be able to share.
Enable Quick Share from Settings.