I use coredata

Thank you for your reply. As a beginner, I still have some confusion. I have created two apps with the same .xcdatamodeld file, one of which contains the Core Data model and the other does not. When the app without the model is installed, all the data from the previous .xcdatamodeld file that contains the Core Data model gets lost. If I do not create a .xcdatamodeld file, I receive an error stating that the file does not exist and I cannot use Core Data. How can I resolve this?

Additionally, one of the apps created shared files. After uninstalling that app, the shared files still exist. However, I would like certain shared files to be deleted when that app is uninstalled. How can I achieve this? Thank you for your assistance!