Update 8 April 2022
The issue affecting the imports on the Tax Year-end instances has been resolved at the same time the Release 5.8b software was deployed.
You will be able to do imports on Tax Year-end Instances on Release 5.7b and 5.8a.
Original post:
We are aware of an issue where you will received the error message "Import file not found" when you import an ETI take-on CSV file and Flexi Imports into your application.
The functionality on the Live payroll works as expected, and only affect the tax year-end instance systems.
There is currently no a work-around to resolve the issue.
The Sage development team is currently investigating and a solution will be deployed to resolve this issue as soon as possible.