Where’s the option to transfer contacts to phone storage on Redmi Note 4?

1. From the device’s Settings, tap System apps > Contacts > Import/Export contacts.
2. The Import from SIM card 1 and Export to SIM card 1 options are used to transfer contacts between SIM card and phone storage/Xiaomi account/Google contacts.

But please note that if you’ve sign-in your Xiaomi account to your phone, you won’t see the phone storage option. This is how Xiaomi phone works. Once you sign-in your Xiaomi account to your phone, you can’t save any contacts to your phone storage.