For internal parent facing communications we use our school portal (SchoolBox) to store pdfs which are linked in news post. For more substantial documents we need to share beyond the intranet like publications, handbooks, songbooks/event programs, we have been using Flipsnack. We too moved from Issuu for costing reasons and have been really happy with Flipsnack. It’s analytics are pretty good too and the pricing was way more appropriate for our needs!