Data Explained | Why aren't there any creative images for GCM in my Display dashboard?
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Unfortunately, the Google Campaign Manager API does not provide the URLs that ChannelMix needs in order to display the creative images in the Display dashboard.
There is a Google Help Center conversation here where Google confirmed that this functionality doesn't currently exist and noted that they created a feature request to add this functionality.
NOTE: The information provided here was thoroughly researched and reviewed by the ChannelMix Data Engineering and Integrations teams and found to be accurate as of 4/17/2023.