Data Explained | Why aren't there any creative images for GCM in my Display dashboard?
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.