Select 'Inventory' from the left hand menu

Search your inventory for the item you want to add to a folder

Click the three dots to the right of the item

Select "Move to folder"

Choose the folder and select "Move". You will be prompted to confirm that you want to move the item. Verify the folder you are moving the item to, and select "Move".

Tap ‘Inventory’ on the bottom menu of the mobile app

Use the search bar to search your inventory for the item you want to add to a folder

Tap on the item to view its information

Tap 'Options'

Tap 'Move to folder'

Choose the folder and tap "Move". You will be prompted to confirm that you want to move the item. Verify the folder you are moving the item to, and tap "Move".