When the dry-run of an import fails, a summary is shown (Bug #46712). To allow further analysis of the problem and ease problem reporting, add buttons that will allow to download summary and the log file. Show the buttons only when an error happend. But then still hide them behind a "Further information" tab, sliding panel or the like.
This issue has been filed against UCS 4.3. UCS 4.3 is out of maintenance and UCS components may have vastly changed in later releases. Thus, this issue is now being closed. If this issue still occurs in newer UCS versions, please use "Clone this bug" or reopen this issue. In this case please provide detailed information on how this issue is affecting you.