Symptom:
When clicking the Import Prev button 
at the bottom of the Column in import mapping, it does not open a preview.
Cause:
Pop-Up blocker is enabled in browser settings.
Resolution:
Manage exceptions to allow Pop-ups for https://www.abilaelevate.net in settings of each desired browser.
Note: Assistance with 3rd party applications such as browsers is outside the scope of Abila Maintenance & Support. As a courtesy, some helpful links have been provided below:
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Chrome: Block or allow pop-ups in Chrome
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Firefox: Pop-up blocker settings, exceptions and troubleshooting
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Internet Explorer: Change Security and privacy settings for Internet Explorer