There are many different ways to find your CSV export:
1_Click on the Windows notification that appears at the bottom on your screen. This Notification will only appear if your Permission settings allow platform notifications.
2_Click on the bell icon (top right hand side) and then click on "Click to download".
3_ Go to "Apps Menu" and select Settings area and then click on the Export Summaries tab. This area will show you a list of all the reports that you have exported/shared from the platform.
4_Press Ctrl + J (Windows) or Cmd + Shift + J (Mac) on your Google Chrome browser. It will open an extra tab showing you the latest downloaded files.
5_Check your Email Inbox. Depending on your settings, you might have the option of receiving an email notification with a direct link to access the export report. You will need to have selected this option in you user account details which you can update yourself via the cogs menu.