Click on the Dump Data icon at the top left in the sidebar. This will give you a file named “Backup.postman_dump”. Save the file to your local disk.
Click the Settings icon in the top navigation bar.
In the modal that shows up, select the Data tab and click the “Choose file” button.
Select the file you exported from the legacy app.
If all goes well, all your collections, environments, header presets, and global variables will be available inside the packaged app.