I found this link which help me finally get my PC Suite to recognize to my mobile LG G3 and I successfully got to sync my photos and videos!
I cant post link in this forum but i found it on reddit website under the question "Anyone having issues connecting their phone to a computer?"
When you connect your phone, the device should recognize that it's connected to a computer, and it'll probably say that it's MTP.
Step 1: Connect your phone via USB to your computer,
Step 2: give the phone about 10-20 seconds, then drop down your notification bar and click that USB notification that says it's connected with MTP, and it'll bring you to the USB settings. (You can find this message in your notifications - just pull down your notifications by scrolling from top of your Home Screen down to get your notifications on your android)
Step 3: With MTP already checked, tap it again, as if you were checking MTP for the first time. This prompts the computer to read your device.
Like I said, I know it sounds really stupid to have to do, but it works for my phone, and hopefully it works for you.
This work for me, after trying for 3 days to install and re-install my PC Suite and my USB driver, plugging in and out my device in my computer, nothing work, until i found the notification message and that is where you find the option "PC Connection". I'm so relief! and so Happy!!