The most common reason why a creative bulk import might fail falls into the following two categories:

1. The imported file is not properly organized. Please refer to the related guidelines to learn how to properly organize the folder: 
   
   
2. The manifest.json file is missing or not properly formatted. Please refer to the manifest.json guidelines to properly format this file: Creatives Bulk Import: Formatting Guidelines for the manifest.json file
   
   
3. The Creatives that you are trying to upload are not supported. Please refer to the Creatives guidelines for Display () or for Video creatives (Video Creatives Specifications) to learn about about supported formats.