Managers can update the following of their direct reportees through the mobile app. If you are not getting these options then it has not been allowed as per your company policy.

1. Updating employee's photo
2. Updating Manager
3. Updating Work location

To understand how to access employee's profile page refer to the article on "Team management through mobile app"​

Once you are on employee's profile to make these changes you need to tap on the highlighted areas as shown below.

When you tap on the edit button on Official details the popup as shown below will be visible.

Through this you can update the employee's manager and work location mapping.