UI Element specifications notes
We’ve introduced UI element specifications notes. In contrast to comments that don’t move automatically with your content you can also annotate directly on an element with the advantage that the annotated note moves with the element once you change its position.
You can leave so called element specifications when selecting an element and clicking on the element specification tan within the properties window and leaving your comment there.
In Preview simply choose the element specification tab and click the element in the layer view to access the element specification note.