Hi,
Thank you for raising your concern to the Google Ads API team.
Please be informed that not all features can be tested on a test account. This includes bid simulations, conversion uploads, and billing. Other features, including recommendations, have limited functionality within test accounts because test accounts do not generate serving data, more information here: https://developers.google.com/google-ads/api/docs/first-call/test-accounts#limitations
One listed requirement for HTML5 ads is that the the account has spent more than $9000 USD, and is more than 90 days old, which would not be possible on a test account. In order to upload HTML5 media ads, you should refer here for more information on the requirements. We recommend that you test the said feature on your production account that can meet the requirements.
Let me know if you have any questions.
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Google Ads API Team |