Updating Added User & report visibility.

Updating Added User & report visibility.

I have an application where different users login in and track their time allocated to a job.

In the report view I used to be able to only show the logged in users records.

The problem I have is that I have downloaded a CSV of all the records, updated a few things and then re uploaded to the system.

It appears I have lost the "Added User" element.

Previously I could use this formula to restrict records:

Added_User== zoho.loginuser

However, because I uploaded it it has loaded myself as the added user. At the moment, this means if people want to see their records, they also have to see everyone elses because I have had to set the report to "VIEW ALL".

is there a simple way around this so I can update each record with the correct "Added_User"?

Thanks in advance.