Droppy Premium Subscription will give your users the option to subscribe to a premium plan that will give them some additional features like larger file uploads, longer file storage, no advertisements and lock their uploads with a password. The plugin will charge the user every billing cycle (You can set your own price, billing cycle etc.), and checks if the payments are successfully made. Users can easily cancel/re-subscribe using their own control panel.

Demo: https://codecanyon.net/item/droppy-premium-subscription/13556620