Once you create a milestone for a version of a Fusion design, you can edit its name and description.
In the Data Panel, click the version drop-down in the lower right corner of the design’s thumbnail.
Hover over the milestone you want to edit and click More.
Click Edit Milestone.
Edit the description and milestone name.
Click the checkmark button to commit the changes.
In the navigation panel, open the detail page for a design that requires a milestone change.
Click the version selection drop-down for the design.
Select the milestone version of the file that you want to edit.
Click on the ellipsis in the upper right and select Edit Milestone.
Revise the version description and milestone name in the Edit Milestone dialog.
Click Update or press Enter
to update.