Ink only works with Wacom graphics tablets.
Symptom
Ink does not work with brands of tablet other than Wacom.
Solution
Ink works only with Wacom tablets. This document will be updated as more information becomes available.
Important: Information about products not manufactured by Apple is provided for information purposes only, and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.
Document 17159, "Locating Vendor Information" can help you search for a particular vendor's address and phone number.