Expenses 21A Update - "Digest Email"

Summary

Expenses 21A Update - "Digest Email" - Does anyone know what this refers to?

Content

Hi Everyone - I am not familiar with a workflow or any email that is generated from expenses as described in this 21A update.  Can anyone point me in the correct direction?    Does this only relate to the mobile app even though it is an email?

DIGEST EMAIL UPDATES TO DISPLAY PREDEFINED NUMBER OF EXPENSES

To improve usability, limit the number of expenses displayed under each section in the digest email to three when there are more than three expenses that require the employee's attention. Employees can access additional expenses by clicking the link in each section to review the expenses in the Travel and Expenses work area.