Why is there a 'No Supplier' folder in my Procore documents?

1Breadcrumb currently accommodates 3 different folder structures 

1. Group by Supplier
2. Group by Feature
3. Legacy

If 'Group by Supplier' is selected, all documents will be sorted into the supplier category that the user chose when completing their check in and induction onsite. If the user's induction doesn't request for them to pick a supplier, the file will be saved in the 'No Supplier' folder in Procore.