The paths to the OSX cache folders of the Telegram for macOS native app.

Stable

/Users/%username%/Library/Containers/ru.keepcoder.Telegram/Data/Library/Caches/ru.keepcoder.Telegram/cache

Beta

/Users/%username%/Library/Caches/ru.keepcoder.Telegram/cache as well as Containers/ru.keepcoder.Telegram/Data/Library/Caches/ru.keepcoder.Telegram/cache