I'm sorry. We have not supported or worked on Adobe Ideas for three years. What you're describing happened for most people when iOS 9 came out. Because the app was discontinued, during that time, work was no longer being synced to Creative Cloud but I hope these steps will enable you to recover your work:
01 Back up your iPad to your desktop machine using iTunes.
02 Browse to https://www.macroplant.com/iexplorer/tutorials/how-to-browse-backups-on-iphone on your desktop, and follow the directions there to get access to the backed up files. (Downloading and installing the iExplorer app on your desktop is one of the steps.)
03 Export the folder associated with the Ideas app (which should show up as "App - com.adobe.ideas.ipad" in the iExplorer window), so you can access the files through your desktop file browser.
04 In your desktop file browser, navigate to "App - com.adobe.ideas.ipad/Library/Private Documents/documents/sync/files."
05 Take any of the .idea files in that directory that you want to retrieve and upload them to your Creative Cloud account, either through a web browser or through the Adobe Creative Cloud desktop app.
To import the .idea files back into Draw:
01 Launch Draw. Open the settings panel and tap on "Import Ideas Files". Then, tap on the import option desired. You can either import all the .idea files or pick and choose which files to import.
To import the .idea files back into Ideas:
01 Uninstall and reinstall Ideas. Launch Ideas.
02 For each file you want to import, tap the "New From:" button at the bottom and choose "Creative Cloud." Then, choose the file you want to import.
I hope you're successful at recovering your work.
Thank you so much!
I've imported all my files .ideas in Adobe Draw.
Oh good. I'm so happy about that.
And, thanks for letting me know; you're the first person I've suggested it to who's let me know it worked.