The new Beta of Creately Next was built from scratch and is very different from the current version of Creately that you have been using. All the diagrams you have created in the current version of Creately will be portable to the new Creately in future. But right now the new and the old app work on separate storage systems. So the diagrams you create on the Creately Next is only visible in the Creately Next and the diagrams you create on the Creately is only visible in the Creately.
We will let you know when you are able to move your old diagrams to Creately Next.