Telegram app stores all these media files in the cache partition so you can easily clear this cache without any problem. This can be cleared without deleting your chat from the app. This is how you can clear the Telegram cache from your smartphone and get your storage back. You can get your media back whenever you want them, just go the chat and download all the media again.
- Open the Telegram app and go to Settings then Data and Storage.
- Then tap on Storage Usage.
- Tap on Clear Telegram Cache.
- You can also select the automatic cache clear slider.