Updating an existing iBook using iBooks Author?
I need to update an existing Apple iBook created in 2015 by adding an additional Chapter and a revised Introduction.
Although Pages is required for new publications I understand I can still use iBooks to access and update as I hear there are potential formatting problems in migrating to Pages? (My iMac uses High Sierra and I'm considering updating to Catalina if this would help.) Any suggestions gratefully received.