Mimeo Photos for iPad and iPhone

I have just created a large photo book taking many hours of work. When I opened my iPad after 24 hours, the Mimeo app page said there was an error and when I pressed try again the screen was blank. I tried to download the app agin but when it opened it was blank. I tried logging into my account on line and no projects were showing on my page. I am extremely distressed that I may have lost all my work. Please can you advise what I should do.Many thanks

Is it possible to create new projects on an iPad when you are on the go and then add them into your previous projects on iMac when you get home so that all projects you have worked on over the years are all stored together on the iMac?