InVision is a beautiful tool for creating interactive prototypes from existing mockups. The project repository is designed nicely with an invitation to add a new project. Once you click the invitation, it flips over and the new project name can be entered. Projects can be reordered with drag and drop.

Once inside a selected project, it is easy to upload all of your mockups with more drag and drop capabilities. The project can be shared for testing.

From start (the video demo) to finish (sharing the link for testing) the experience of using InVision is exceptional.