This is the 15641st most frequent Russian word.
прикрепить
"Прикрепить" means "to attach" or "to fasten."
The word 'прикрепить' is used here to mean 'to attach' an object to another, specifically a document to an email.
Я могу прикрепить документ к письму.
I can attach the document to the email.
The word 'прикрепить' is employed here to describe the act of fixing or fastening an object (the photograph) to a surface (the wall).
Она прикрепила фотографию на стену.
She affixed the photograph to the wall.
In this context, 'прикрепить' indicates the action of attaching notes to a physical object (the board) to ensure they stay in place.