Please answer the title!!! I am stuck!!

ANewKindOfSpecial Bubblegum_696 romancedramafantasy Polarbear111111 YoungWriterContests WritersAssistance
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I have a trailer I wan to add to a new story of mine but I don't know how to add it. When I press add video, it says it has to be on Youtube.  If I press pic, it only shows pictures from my gallery instead of videos aswell!!

Please help!!!