New app, upload image problem


I created new app, and when I tried to upload an image, I got an error saying that only PNG, JPEG, etc. files are supported. I tried to upload PNG. So I saw an error message. But when I go to Details page I see an image there. Error?


Same thing happened here. Curious to know the issue. Suspect that, because the image upload field is emptied after successful upload, a timing issue causes the warning.