All your chat data is stored in the cloud. This allows you to use Telegram even if your device is not connected to the Internet and synchronize all the photos, videos, and files you have sent in your chats. You can send as many files as you like over chat, taking into account that the limit per file is 2GB. You can also send files that disappear a few seconds after being viewed, with the added security that this self-destructing content cannot be screenshotted.