No, you cannot update the binary for a mobile app after it’s been signed and delivered by the store. External data files are easy to do and its where you keep your unique per-customer data if you don’t want to use an online database for it.
thank you very much rob. It is very important for beginners to know which way is right. I’ve seen other applications have their external files.
Any suggestions on encryption? or directory where I can store it? I used system.documentsDirectory
Regards
system.DocumentsDirectory would be the proper place to save this data. We have our own crypto.* library that you can use for encryption.