How to handle 'media type mismatch' error message for Sponsored Brands?

Sometimes Sponsored Brands cannot be created and the Ad Optimizer displays the error message 'media type mismatch'. In these cases, the image type (logo) used for the campaign was not identified correctly. Here is how to solve the problem:

  1. Go to your Amazon Advertising Console and access the Creative Assets (via the menu on the left-hand side) and search for the creative or upload it here if it is not already there

  2. Select the correct 'Asset type' (e.g. 'logo')

  3. Go back to the Ad Optimizer and retry creating the campaign
    (In case this error message appears for an existing campaign, changing the 'Asset type' in your Amazon Console should be already enough and your existing campaign will be updated accordingly (no need to re-create the campaign))