Hi,
Navigating list of Attachments in an Item has a different behaviour when compared to Navigating list of Notes on an Item.
Navigating List of Notes
left-arrow : moves back to the parent Item
right-arrow : moves to the next Note in the list
up-arrow : moves back to the previous Note in the list
down-arrow : moves to the next Note in the list
Navigating List of Attachments
left-arrow : moves back to the previous Attachment in the list
right-arrow : moves to the next Attachment in the list
up-arrow : moves back to the previous Attachment in the list
down-arrow : moves to the next Attachment in the list
So the main difference is in how the left-arrow behaves in both the cases.
I feel the left-arrow behaviour of navigation of list of Notes is correct, as it allows me to quickly go to the parent item without having to step through each and every note.