Click IMPORT in the Asset Browser.
Navigate to the folder containing your Scaleform Studio project.
Select the Scaleform Studio project file of s2dproj type.
Click Open.
The project is imported into a folder named s2d_projects in the Asset Browser.
Navigate to the imported project in the s2d_projects folder.
Double-click the s2dproj project or right-click and select Open to open it in Scaleform Studio editor.