Using the app with only local storage is possible, but generally not
what it was designed for. Normally when you transition from local
storage to cloud storage, the app should store the local data to the
cloud - but it appears that is not what happened for you. Since the
data are stored in two different locations, they should still be on
your device. So the easiest way to get them back would be to go to
settings and switch back to no cloud mode.
Of course I would like to understand what is going wrong - that would
have been easiest if you had sent an in-app support request right when
it happened, as that would hopefully have given me some insights into
what the app thought it was doing and why that failed.
I'll try to recreate the scenario here (it's not something that I test
frequently) and hopefully will figure out how to make sure this works
better in the future.
/D