This library works with platform that includes TinyUSB stack, typically you will see Adafruit_TinyUSB_Core inside core folder. Supported platform are:

• Adafruit_nRF52_Arduino
• Adafruit ArduinoCore-samd TinyUSB must be selected in menu Tools->USB Stack

In addition to CDC that provided by the platform core, this library provide platform-independent for

• Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ...
• Mass Storage Class (MSC): with multiple LUNs
• Musical Instrument Digital Interface (MIDI)
• WebUSB with vendor specific class

More document to write ...