Can I edit with Affinity Publisher?

Almost every product we produce comes with a .idml file. This is an InDesign file for older versions of InDesign. Affinity Publisher can open .idml files so yes. You can open and edit with Affinity Publisher. However, we do not check the files in Affinity. Some designs open up beautifully in Affinity, others don't. Your mileage may vary. Please see more about compatibility in this article.