Short answer: the safest Telegram cleanup starts by separating cache, duplicated media, and stale downloads from the files you still actively rely on. The goal is to remove storage weight, not damage the conversations or documents that still matter.
Telegram storage gets messy because the app can collect several kinds of clutter at once: cached media, downloaded files, videos from channels, forwarded images, and documents that were useful at one time but no longer need to live on the device.
What to clean first in Telegram
Cached media and temporary files that do not need long-term local storage.
Old downloaded videos, documents, and channel media you no longer open.
Repeated files and duplicated downloads that now exist in more than one place.
Low-value group-chat media before one-to-one conversations or work files.
How to avoid losing files you still need
Treat temporary cache cleanup and important file review as two separate passes.
Keep travel, work, legal, or family documents for a slower second pass.
Assume that high-value files deserve review even when Telegram labels them as large or old.
When Telegram is only part of the problem
Telegram may be the visible clutter source, but Android storage pressure often spreads across downloads, screenshots, and app media outside Telegram too. If the phone is still full after the app cleanup, widen the review into the broader Android storage route.
If Telegram is only one layer of the problem, continue to free up Android space. If you need the iPhone-specific version of this workflow, open How to Clean Up Telegram Storage on iPhone.
Safe Telegram cleanup removes disposable storage first and leaves useful files for a slower, deliberate review.