Data imports, data refreshes, and areas where you upload files associated with users (user files, user photos, temporary passwords) typically require that you include the User ID associated with each individual user.
Article
Number:101494
Products:
School_Management_System
The User ID is the unique number assigned to every user in Core. Whenever you create a new user in Core either manually or via a Data Refresh, the system always assigns them a unique User ID.
Tip: In Lists and Reports, the User ID is sometimes referred to as the WH System ID.