Consternation editing external images

[Jkoseattle]

I don't understand the workflow for editing an image that is already referenced in a Moho project. I will edit an image in Photoshop that is already in use in my Moho project, (same behavior for both .psd and .png file types, btw), and save it, and my edits will not appear in the Moho project. I have tried closing and re-opening the project, tried going into Set Source Image and re-selecting it, doing both of these things multiple times, and sometimes I can get Moho to see there's a new file and sometimes I can't. It's hit and miss, and I figure there is some recommended way of doing this reliably. Also, none of these files has more than one layer in them.