Summary:
The Copy From option allows the user to copy time, time off entries, comments etc. from the last saved timesheet. It could be from the former timesheet period or a later timesheet period. In this case, the time entries are not getting copied from the last saved timesheet using the Copy From option.

Cause:
This issue occurs when the timesheet that you are trying to copy from or the timesheet you are trying to copy to, has an auto-populated holiday or any holiday icon for one or more days.

Resolution:
User has to manually fill the timesheet.