HCM RUP19: Add attachments to provide documentation as part of the self-service benefit enrollment

We have applied HCM RUP19 and I can see 2 areas where I am struggling: I can't find any document for how to add attachments in Employee Benefit self-service enrollments. Where can I find more info on this topic?

I see this note but not much:

Benefits administrators can use the Manage Benefits Files page to create and upload benefits-related templates for employees. For example, you can upload templates for benefits-related documents such as birth certificates and proof of good health. Using Self-Service, employees can download these templates, fill them out, and upload them as attachments during benefits enrollment. With these new capabilities, employees can provide required benefits-related information on a more timely basis and minimize potential gaps or delays in coverage.