updates an existing preview video for this item
public static bool UpdateItemPreviewVideo(UGCUpdateHandle_t handle, uint index, string pszVideoID) { InteropHelp.TestIfAvailableClient(); using (var pszVideoID2 = new InteropHelp.UTF8StringHandle(pszVideoID)) { return NativeMethods.ISteamUGC_UpdateItemPreviewVideo(handle, index, pszVideoID2); } }