Here is a back-end view of the Database, Table, and Fields behind a web-based system. In this case it is a MySQL database. When you press the submit button, a record is added to a table like the Content table. The actual content of the page is stored in a FIELD called Content. Notice the text highlighted in blue. That is NOT what the person typed into the Web Edit Window. That is the HTML that gives the results dictated by what the user typed.

In particular, what you see as the contents of the field in this record is pure HTML – which is to say pure ASCII text, nothing more. You cannot imbed an image in there. You can only imbed HTML code.  The terxt can contain code that can cause images to be displayed, even though the images are not physically part of the message content and may not even be saved on the same server.