After import data by data connector or database connector, click the connector icon and choose Auto Refresh... to open settings dialog. Check the Refresh Periodically checkbox and you can set the interval for automatic refresh.

The refresh interval can be range from 5 seconds to 3 days. Notice that it should be a value that is multiple of 5 sec.

After set with this refresh periodically, imported data will be updated if imported file has been changed outside or data in current window is not consistent with original data when time up.

Mouse over on the connector icon will show the auto-refresh information such as refresh interval and the remaining time to next update.

Also, at the right-side corner of the status bar will show the countdown to the next re-import time info.