Html email does not show images

I have created a html email (news letter). But the images when it is sent with https://putsmail.com/ does not show. I have tried to host the images with

But images does not show

I tried both with gmail and proton.

So has any one any advice how I get images to display in a html email when sent to end user. ?

Perhaps there is an issue with the html. Please post a sample html email that is failing.

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