Why i can't find or transfer my videos from my Galaxy S6 to my PC ?

[AC Question]

I have took pictures and videos with my S6 camera. they can be seen with my S6. unfortunately when i try to transfer them to my PC with USB cable, i can only find and transfer my pictures and there is no sign that the videos are even exist. I tried to search my phone with the PC but there is no sign of them. Again - i can easily find them in the S6.
Any ideas how to solve that?
Thanks
Thomas