Step 1: Download and Install ImTOO iPhone Transfer
Download ImTOO iPhone Transfer here and install the application on your computer.
Step 2: Transfer music/videos/photos from PC to iPhone
1. Locate the library/playlist in which you want to add files.
2. Click the "Add files to iPhone" button, and choose the "Add Files to List" option in the drop-down list, then select the required files in the dialog that opens and start to transfer them to iPhone.
Tip: If you want to add all the files in a folder, please click the "Add files to iPhone" button and choose the "Add Folder to List" option, and then locate the folder and transfer all the files in it to iPhone.