The Import Issues list, found at the bottom of the Import dialog, lists any issues related to importing Excel values into the Revit element properties.
There are three kinds of import issues:
This checkbox toggles the display of non-critical message issues.
Saves a copy of the Import Issues to an Excel spreadsheet.
NOTE: refer to Bidirectional_Parameters for related information
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If you'd like to upload a file to help explain the issue, you can upload a file to Hightail.