dbinbox - dbinbox makes it easy to send files
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
Send To My Cloud - Let your users upload files to your cloud storage
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
DriveUploader.com - Upload component for receiving large files on your websites or in products.
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming