I am reposting a great little Adobe forum response from Christopher Bank about how to get text to wrap around an image in Edge Reflow without using CSS Regions.
The first step is to draw a box, and then add an image at the top and then add a text box below that. You can set the width to auto and it will fill the whole box.
After that select the text and make it “float:none”, set the margins to 0, and make sure the clear is none (no buttons selected).
The last step is to change the image to float: right
That should do it. After that you might want to turn the div into a group so it’s easier to move everything as whole. If you try to move the image or text using drag and drop it’s likely the text will go back down below the image again.