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You do not have to run video at all in DG. You can simply run image ads if you wish. Of course if you run video ads there’s a good argument to include assets that serve well across different device types. Typically this involves either providing portrait (for mobile) and landscape (for other devices) versions OR a single square video which can work fairly well globally.
The vast majority of advertisers still don’t produce videos in portrait format. Google will actually convert these for you, but it’s nothing more than adding space around the original video… I actually find this performs more poorly than just running landscape… many users will rotate their phone orientation to compensate. Yes, just ignore the warning.
Those that do produce portrait videos are usually influencers or advertisers that heavily rely on social media for new business.
Importantly, don’t let Google reps push you around – their JOB is to get you to spend more money. Sometimes that aligns with your business goals but often it’s only self-serving for Google.
