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?

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.

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