We also have a reference to a memorandum sent by our embassy in Ankara. I think they called it a “flash report” from Canada's embassy in Turkey highlighting a major escalation of the Nagorno-Karabakh conflict. The flash report also mentions that in June 2020, Turkey and Azerbaijan announced Azerbaijan's purchase of six TB2 drones but that the deal's completion had not been confirmed—
On April 27th, 2021. See this statement in context.