Transfer files to iPhone with iTunes
Connect iPhone to your computer using the included cable.
In iTunes on your computer, select iPhone, then click File Sharing.
Use the File Sharing section to transfer documents between iPhone and your computer.
Apps that support file sharing appear in the File Sharing Apps list in iTunes. To delete a file, select it in the Documents list on your computer, then press the Delete key. For more information, see the Apple Support article Use iTunes to share files between your computer and your iPhone, iPad, or iPod touch.