I'm working on a Character Sheet Guide for the Roll20 wiki (similar to the ones done for Pathfinder and D&D 5e) and would like to insert a picture of the character sheet. How do I accomplish this? I click on the imbed file and drop the image from my hard drive on the file name but the preview doesn't show it, instead it shows on my hard drive to the image. Do I need to upload my images somewhere first and then use the URL to the image file? Thanks.