From the Dropbox set up page, if you click “Setup Dropbox Integration”, this will take you to the Dropbox website to login and approve access for QuickFile
Tagging is linking a payment defines what the payment is (e.g. from a client, to a supplier, transfer between accounts, tax payment etc.).
Project tags is a way to group sales and purchases invoices, estimates and purchase orders to a “project” so you can see things such as income and expenditure on a project by project basis. There’s more information on this here: Projects in QuickFile