Can't use this! – Video lab - free video editor movie collage photo video editing for Vine, Instagram, Youtube Review

When I load my vid from cam roll. Continues to say processing. All I want is to link two vid together!! Can't find an app any where to do this.. This one has that option but I can't try anything! Ugh. :/
Review by Midas it's on Video lab - free video editor movie collage photo video editing for Vine, Instagram, Youtube.