According to the LG website, you need the PC Suite software to be able to transfer everything from contacts to photos to your phone. Check here:
support lg-LGA341
Here are instructions from the manual:
Synchronize your phone with your PC
You can synchronize your phone with your PC to make sure all your important details and dates match, but also to backup your files to put your mind at ease.
Backing up and restoring your phone’s information
1 Connect the USB cable to your phone and your PC.
2 Select the PC suite from the popup menu in your phone. And run PC Suite Program in your PC.
3 Click the “Phone Backup & Restore” in PC suite (Tools > Phone Backup & Restore), and select Backup or Restore.
4 Mark the contents you would like to back up or restore. Select the location you would like to backup information to, or restore information from. Now Select Back Up or Restore and Click OK.
5 Your information will be Backed up or Restored.
Viewing your phone files on your PC
1 Connect the USB cable to your phone and your PC.
2 Select the PC suite from the popup menu in your phone. And run PC Suite Program in your PC.
3 Open LG PC Suite icon in your PC which is already installed, after searching the phone it will be connected automatically.
TIP! Viewing the contents of your phone on your PC helps you to arrange files, organize documents.