Upload and save an attachment that applies to the whole layer and not just one element

Upload and save an attachment that applies to the whole layer and not just one element

I have just created a layer that shows the state of all our 'problem' trees.  The list has been created by a consultant arborist and they fall into five different categories varying from 'fell' to 'watch' to I have a layer with points in five different colours.  Very useful for Councillors and the eventual contractor(s)

I have uploaded the consultants report to one tree but I would like it to apply to all.  Is there a way of making it downloadable from all - I dont want to upload it about 40 times!