The issue has been fixed with Apple’s MacOS High Sierra 10.13.4 Beta (17E139).
You can try out the fix by updating your machine to the beta update from Apple.
Let us know if the issue is fixed for you after aforementioned High Sierra beta update.
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Having the same issue - can't package any files after updating to High Sierra and latest InDesign. Also, doc previews are not loading in the start up window - just shows default image box.