Toonboom Storyboard Compatibility issues between Storyboard 7 to 6


Working with iOs Big Sur 11.2.3 and Toonboom Storyboard 7.

The issue is that my backups are not completely readable by Toonboom Storyboard 6. Only the first half of the storyboard appears when importing.
We’ve tried to simply open and also to insert the board into a new file. Nothing worked.

Do you know a way to make it work ?