I moves this topic in the Premium Features category as Custom report is a premium feature.
I think that some metrics are missing from Custom Reports as Total amount of downloads for example.
Also I think that some Dimensions are also missing as Download URL or Download title because in my opinion, Event action will probably not get the Download actions as it is not the same event type…
As Custom Reports is Premium feature, you can directly ask the customer service: [shop at innocraft dot com]
Then when it is fixed, don’t hesitate to post a message here 