Mysterious Spot in Cloud Photo from Pornichet

Summary

A passenger took a photo of clouds from inside a car, but while reviewing the images later, she noticed a strange spot that she hadn't seen at the time. Although the photo is clear, there is no direct visual confirmation of the object, making interpretation difficult. The spot could be explained by an insect or a defect on the windshield. The case lacks additional information to clarify the nature of the spot, keeping the mystery unresolved.