VAULT = private channel = warehouse (ឃ្លាំង). Only you see it.
MINI APP = showroom (ហាងបង្ហាញ). Nobody sees movies here, just posters.
BOT = the shop worker. Copies from warehouse → gives to customer.
COST = $0. Telegram stores everything free.
RULE = save every movie's shelf number (message link) in a backup file.