Newsletter images not showing up on mobile

I embed html code vs uploading images bc I want to be able to control the sizing. The issue I’m having is that when I send my newsletter out, for some reason images don’t show up on mobile (which is where a HUGE percentage of people interact with my content!) They do show up on my website and on my computer email. Here’s the html I’m using and then what it looks like in the email:

Are you using a HTML card to place the image in the post?

I just tested this myself and it worked for me. I had to click on “show images” in Gmail (both desktop and mobile). In Fastmail the image appeared right away on all devices.

It sounds like it could be an issue with your specific mobile email client, or perhaps something to do with the way the images are hosted.