All of these options can be valid reasons to export your work in an online collaborative platform, but the most common scenarios are usually:
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At the end of the project in order to showcase your finished work. (This is typically the final step to present the completed project.)
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At any point in the project in order to receive feedback from other group members. (This is common to ensure continuous improvement and collaboration throughout the project.)
So, while you can export your work at various stages for different purposes, the two that stand out most in importance for collaboration are exporting for feedback and showcasing at the end of the project.