If I break down the adset by 4 country each. That would be 4 videos x 4 thumbnail x 4 countries, a total of 64 adsets to test under 1 campaign? By admin | August 30, 2019 | Like | 2019-08-30 17 October 2019 Each adset can have 4-5 creatives. You can combine thumbnails and videos and see what combination works best. 64 adsets is abit too much to start with. FB prefers less adsets but with higher budgets.