*If you are still having issues with a specific file, it helps to know: are you seeing, if any?
Select from the dropdown menu (or press Ctrl + E on Windows / Cmd + E on Mac). In the Format dropdown menu, select InDesign Markup (IDML) . Choose your destination folder and click Save . Opening the Converted File Launch your older version of InDesign. Click File > Open and select the saved .idml file. how to convert indesign file to older version link