the details of a matter are its most problematic aspect.
“I know this is taking a long time, but the devil is in the details.”
Frequently Asked Questions (FAQs)
The idiom ‘the devil is in the details’ means “to deal with a difficult situation without being harmed or damaged”
Example usage of idiom ‘the devil is in the details’: Newspapers have weathered the storm of online information by providing news online themselves.