There are number of reasons why the email and attached documents have not come into the Incoming Images Queue.
1 - The attach document is not a valid PDF document.
2 - The email contains a long email trail. - The email containing the timesheet image should be simple and not contain a complicated email trail.
3 - The email contains an attached email - This is not a suitable attachment and the system will reject this email.
4 - the Etz incoming image email is the CC email address on the email.