LOS ANGELES (Variety.com) – An all-new documentary series following Demi Lovato’s ups and downs over the last three years is coming exclusively to YouTube, as part of the video giant doubling down on its music, celebrity and creator-focused originals strategy.In addition to the new four-part Lovato docuseries, YouTube has renewed four original projects featuring big-name digital talent: “Instant Influencer with James Charles,” “The Creator Games Presented by MrBeast,” a sequel to interactive series “A Heist With Markiplier,” and “Retro Tech” hosted by Marques Brownlee.“We’re continuing to invest (in originals) – and we’ve investing more,” Robert Kyncl, YouTube’s chief business officer, said in an interview.