What is the easiest way to transfer music from Mac to iPhone without syncing

Aiiseesoft iPhone Manager is a free desktop tool for Mac and Windows with an intuitive interface that allows you to transfer music from Mac to iPhone without having to sync with Apple Music, and the transferred music is stored in the app on the iPhone, which is legal and safe, especially for batch transfers of 100 songs or more. It is legal and safe, especially suitable for bulk music transfer of 100 songs or more.

To transfer music from Mac to iPhone without syncing:

1. Download the file transfer app on your Mac.

2. Make sure you have the MP3 or AAC music files on your Mac.
3. Download the from the App Store on your iPhone.
4. Connect your iPhone to your Mac using the USB-C/Lightning cable. When prompted to trust this computer, click Trust and enter your password.
5. Open the software and wait for the iPhone to be detected automatically. 
6. Click Media on the left side of the software, when the music list is displayed on the right side of the software, select the music files on your Mac via Add > Add Files to add them, and click 'Apply.' This will transfer music from Mac to iPhone automatically without syncing.
7. Open the software, tap Music to confirm the songs can be played offline.