If you're on an iPad with only 512MB internal memory then it may struggle right now but we'll soon have a release out to combat this.
In the meantime you may be able to save a copy online without opening it first?
-when looking at the homescreen, touch the relevant thumbnail
-in the dialogue box touch the cloud icon
-log in if required and the file should upload.
Once uploaded you can publish your scribe using the desktop version (get the free trial if you haven't tried it yet), or even the free iPhone app if you have access to an iPhone with more internal memory.
I'm glad the work-around worked.
I've updated the post above to show more clearly how this helps.
I have the same device so I'm very aware of how we're doing with the fix! Rest assured we are working on it right now and getting the fix out very soon.