Adding creatives to your campaign is super simple! 

You can add creatives from different parts of the platform:

1.  From the main dashboard selecting the campaign(s) you want to add creatives to, as shown in the video below.

This by default will add a new creative to all the ad sets of the campaign(s) selected. For our example, we selected the campaigns from the Campaign List widget but you can also select the campaigns from any widget.
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2. From Campaign Report page using the drop-down menu shown below.

This by default will add the new creative to all the ad sets of the campaign(s) that you opened.
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3. Again from the Campaign Report, but this time if you click on specific ad sets you'll have the possibility of adding the creatives only to the ad sets that you have selected and not to the whole campaign.

A similar behavior can be reproduced if you have a widget that is grouped by adsets.
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After that, you'll just need to do what you would if you were creating a new campaign!