I've been slow in responding to Claudia about this one (sorry, Claudia!) but I am getting around to it eventually.
Here are some quick steps for those of you that want to attempt it on your own:
1) Take whatever image you want to use and upload to a image hosting service. Basically, that means a web service or website that will upload your original image file and give you a public URL where it can be seen. imgur.com is probably the best. It's free, featureful and easy to use.
2) As an example, here's an image of an old cabin that I just uploaded to imgur.com:
After upload, they give you some tools that will show you the URL to use. You want to use the "direct link" option so that the URL goes directly to the image and not an intermediary page.
3) Now that you have your image publicly hosted, you'll want to use that in your OwnerRez emails. Here is a sample chunk of HTML that you can insert into your emails:
<img src="https://i.imgur.com/6fj1jnl.jpg" style="width:250px;" />
The 'src' attribute is where you put your image URL. Put the image URL inside the quotes exactly as you see above.
4) Use the 'style' attribute to change the image in other ways such as varying the width, height or border. For instance, here I'm adding a 5 pixel red border around the image:
<img src="https://i.imgur.com/6fj1jnl.jpg" style="width:250px;border:solid 5px red;" />
You can see how the above HTML looks by going to this URL in your browser:
JSFiddle is a great online tool you can use to play with HTML and see how it looks. Go to http://jsfiddle.net and put your HTML in the appropriate frame, then click the Run button to see how it looks.
5) After you have configured the HTML to look exactly as you want, copy that into your OwnerRez email template using the HTML editor button. Do NOT copy it directly into the message body. You must click the 'HTML' button on the editor toolbar and insert it there. You will have to determine where in the existing HTML is the correct place to put it. Make sure that your new image HTML does not break existing HTML that is already there. If you don't understand where to put it, to get your image to show up in the correct spot, feel free to ask us for help.