how to insert an image into an iframe?

Ashleygood afternoon, how to insert an image into an iframe from a project and not by link to a third party resource?

i added image to project files but code like this doesn't work.

<img alt = "Mountain" src = "image1.png" style = "width: 100%; height: auto; margin-left: 0.00px; margin-top: 0.00px; transform: rotate (0.00rad) translateZ (0px ); -webkit-transform: rotate (0.00rad) translateZ (0px);