From Zip

To import a previously exported project (refer the Backing up API Projects section), click the Add icon and click the From Zip option.

Figure 1: Navigating to import a previously exported project

Figure 2: Import Project dialog box to browse exported project to import

Click the Import from zip file button to choose the project from the location where it is saved.
Select the following options as required
1. Overwrite project if exists: Select this option if the project being imported is already present but needs to be overwritten.
2. Zip file contains multiple projects: Select this option if the zip file has more than one project.
  
  Ensure selecting the option if the zip file contains multiple projects.
3. Rename imported project: Select this option to import a project with a different name or/and version number.
Click the Upload button.