Enhance Reporting and/or Add Preview option on Import of an Excel Spreadsheet

[dylanyoung-dev]

We need a better way to track what items were imported into Sitecore from an Excel Spreadsheet.

In addition to reporting, it would be great if their was an additional preview step to visualize the imported changes from the defined source, to understand how the exported data would affect the items in Sitecore. Would also be great if from that preview you could mark items you don't want to import or specify if you want it to create a new item or not.