Thank you for sharing your feedback on this experience as well. I apologize if the workaround we recommend is not the solution you were looking for. We are however always open to ways we can better our user's experience and would like to collect a few details from you:
Are you not expecting the image to fill the whole width of the mobile device?
Would the you want the image to remain the same size as in the editor/desktop preview?
Do you want to set a specific width and height to the image for being viewed on a mobile device only?
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