Adding images to campaigns is very simple.
Once you have accessed your dashboard in the campaigns section, just click the View more button
At this point it will open a new page where the created campaigns are already present, clicking the brush you can modify any campaign.
Once you click the brush, it will open the page from where you can add new photos to your campaign.
When the photos are added, just go down and click the Submit for Review button. After that, his campaign with the added photos will be present on the platform.