THIS IS SLATEAPP:

-The video size is small, and does not take up the entire width of the page. Is there any way to autofill like the other programs do below? 
-I've changed the thumbnail inside of Slate, but now on here it doesn't come through. this is the random one that was used by the program, not the one I uploaded. 


THIS IS SIMIAN:


THIS IS WISTIA:


THIS IS VIMEO: