Sending images from a flow / AI node:
1. Can the Message node image/attachment use a variable URL, so the bot
sends the picture itself?
2. On Messenger an image URL in the AI reply shows only as a link
(Telegram shows a preview). Is there a supported way for the AI node
to send an image on Messenger?

Run action tokens: wrong timezone, "null" values, contact display name?
Variables and tokens in Run actions:
1. Our workspace timezone is UTC+6:30, but {date}, {time}, {dateTime}
in Run actions use UTC+02:00 and {timezone} shows "null". Is there a
local-time token?
2. Is there a token for the contact's display name (Telegram / Messenger
name), and a full list of available tokens?
3. Empty variables render as the text "null". Can they render as empty?
4. Are flow variables stored per contact or per thread?