You can only add NFC to a folder using the mobile app
Adding NFC to a folder with the mobile app
Tap ‘Inventory’ on the bottom menu of the mobile app and navigate to the Folder you wish to add NFC to
Tap the three dots to the right of the folder name
Tap 'Add NFC'
Hold the NFC tag against your phone's NFC Sweet Spot until the message shows 'Saving NFC'
You can now tap the NFC Tag with your phone to view the folder. Be sure to touch your phone to the tag and give it a few moments to read.