Do you mean importing backup files from computer to iphone?
Making use of iTunes is a convenient and recommended method to import files from your PC to iPhone. By using this way, you need to install the most recent version of iTunes on your PC. Once you have set up iTunes on your PC, you can go with the following simple steps to transfer all files from your computer to your iPhone:
Step 1. Connect your iPhone to PC with the USB cable and iTunes will be started automatically. Your device will be detected and recognized by iTunes by default.
Step 2. Under the "DEVICE" option, you can find your own iPhone. Just select it and open "Info" tab on the main window.
Step 3. Here, you can check "Sync Content with" option on the right panel, and choose the program on your PC that has the contacts you want to import, including "Outlook", "Google Contacts" and "Windows Contacts".
Step 4. Then you can simply tap on the "Sync" button to begin the syncing process.
Good luck.
02-18-2019 12:51 AM