imported olm file but cannot see the emails. It is being recognised as ‘flagged’ emails can be seen. How do I see all emails?

I exported all of my emails, creating an ilm file. I have imported the ilm file to test whether I can read the emails that I have archived. The .olm file is listed in the sidebar under "on my computer/archived mail" but I cannot see any emails in the outlook window. If I open the "high priority mail" smart folder, I do see all emails from the .olm file that were flagged as high priority. Does anyone know how I can see all emails?

The .olm file contains several folders of emails for different subjects. Could this be the problem?

Thanks in advance