For the website https://www.ny-engineers.com if I add the image it won't show properly for different devices. As mobile responsiveness in HubSpot requires custom coding how can I add an image which will show properly on all devices?
What image are you referring to specifically? That site appears to be fully responsive at a first glance? Also, in general adding image modules to HubSpot templates is fully responsive; could you give me some more info on what exactly you're trying to do?