On a YouTube TrueView mobile app install campaign, the URL_PERFORMANCE_REPORT shows zero clicks in the clicks field.
Running the VIDEO_PERFORMANCE_REPORT and ADGROUP_PERFORMANCE_REPORT for the same campaign shows that there are clicks.
Views, conversions, cost, etc. line up between the URL_PERFORMANCE_REPORT and the VIDEO_PERFORMANCE_REPORT, but clicks seems to not work for the URL_PERFORMANCE_REPORT.
This seems like a error in the URL_PERFORMANCE_REPORT when querying against YouTube campaigns.
Mark