I have installed the silent mode tracker on the employee's computer but I am not able to see the user's screenshots or reports.

The silent mode tracker on the employee's computer might stop working due to multiple reasons. Most of the time this issue can be self-resolved. But we will be happy to connect and fix this for you. 

Please check the below link to check the reasons why the silent mode tracker stopped working.

https://teamlogger.tawk.help/article/silent-mode-tracker-not-working