I usually make a separate thumbnail for vertical posts where I add Steemit background colour arount the vertical image. Then I place this small thumbnail as first image of the post. Not ideal but this way you can show whole content of vertical image if needed.
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Like this:
![Untitled-1.jpg](https://images.hive.blog/768x0/https://steemitimages.com/DQmZCfVFFNnCjFntjt1CLjY6AVx6c5SrnTh3hQ1iNGdPDxP/Untitled-1.jpg)