If I am on my laptop or my phone I can go to Dropbox and click on a picture and it opens just fine. If I try this on my newer Dell Desktop then I get an error message saying Photos can't open this file because the format is currently unsupported. If I click on a photo not in Dropbox on my desktop then it opens just fine. I looked on my laptop and I am using Edge and default app is Photos. My Desktop uses Edge and default app is Photos. I'm sure it is something simple but I don't know why images won't open on the desktop using the same app.