pronunciation - How to say the /p/ sound in the middle of words?

I'm not sure how to say the /p/ sound in the middle of words like apple, puppy, happy etc. Those "p" sounds have a puff of air or not.

For myself I think those /p/ sounds have a puff of air but less than /p/ in the first of words like pen, pan etc. Is it correct or not?

However, I just listened a word "apple" from a video of Youtube but I can't hear or catch a puff of air from /p/ in apple. It sounds like /p/ after /s/ like the words spy, spin etc.