Title says most of it. If I open a TIFF file (named IMG_1234.TIFF) in Photo Beta and then choose File > Edit in Designer... the file will open with Untitled for a name, and that will be the name when I return to Photo via File > Edit in Photo...
This seems wrong to me, I would rather retain the name (IMG_1234) when I save the document in Designer or even back in Photo.
*.afdesign *.afphoto retain the names.