DTUBE error need help!

Hey guys, so I have a problem when uploading my videos to dtube. The past couple of times I have uploaded my thumbnail for my video it will not appear on steemit or dtube! As you know the thumbnail is really important when capturing the attention of viewers and this something I need to resolve immediately! If anybody has any clue as to whats going on with my videos please let me know otherwise i will just have to use youtube! Which i hate!

Thanks!