If you want to use your own icons. upload them to a folder. Let say we make our own images folder. Then inside that folder I make another folder called icons. I will upload all my icons to that folder. I made the icons 32px X 32px in size. I know in some templates you might need to make 2 sizes. one for the Pictures and one for the icons. I had the picture one way to big at 32px so I made it 12px and renamed it with a _sm before the .png and it fit fine. I uploaded photo.png image and video.png image to my icons folder.
I then go put in the URL to the images I want to use.
So in my photos in the Icon I put: https://DOMAINNAME/images/icons/|photo.png
and picture I put: https://DOMAINNAME/images/icons/|photo_sm.png
Then in videos for picture and icon I put: https://DOMAINNAME/images/icons/|video.png
and picture I put: https://DOMAINNAME/images/icons/|video_sm.png
Make sure you put the | before the image file or it will not work and show blank.
Hope that helps everyone to add there own images in.