Where is cost data upload?

It appears that this feature is yet to be made available at this stage, so watch this space because as soon as we know more, you will too!

In the meantime, you can view your linked Google Ads report under the Behaviour report >> Sessions by Session Campaign>> View Google Ads Campaign.

Is it possible to add data via data imports?

At the moment there is no feature for uploading data like there is in Universal Analytics(data imports/custom data upload/data widening). Hopefully in the near future we’ll see this available.

Currently in Universal Analytics under Property Settings