To edit, you must "Check Out" a story. This locks it so designers cannot change text while you are editing. Once done, you "Check In" to save changes and unlock it. View Modes:
Insert notes ( Cmd/Ctrl + N ) for designers without affecting text flow. Adobe InCopy 2020 v15.1.2
InCopy works best when InDesign users create assignments ( .icma files) and include InCopy content ( .icml files). To edit, you must "Check Out" a story