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This function will import folders from older versions of FileBird, which includes folders created from version 3.9 & earlier installations.
It is a particularly useful feature if after updating FileBird you do not see some of your folder structures, which is normal from version 4.0 because our update from version 4.0 was designed to use a separate database for keeping FileBird's folders instead of using the normal WordPress database we were using in version 3.9 and below (because of too many bugs associated with WordPress's media database section).
Please go to Settings > FileBird > Tools, you will see the option there.
Import FileBird folders from version 3.9 and earlier intalls