About apple digestion

No,it is not
The fiber content, while less than in most other fruits, helps regulate bowel movements and may thus reduce the risk of colon cancer. They may also help with heart disease weight loss and controlling cholesterol,as they do not have any cholesterol, have fiber, which reduces cholesterol by preventing reabsorption, and are bulky for their caloric content like most fruits and vegetables

So, apples contains fiber to help you to digeat food, not the opposite.

no it is not
your constipation problem may probably can be solved by eating oily food