Taking screenshots in a Telegram private channel is generally the same as taking a screenshot in any app on your device. However, here are important things to consider:

📱 How to Take Screenshots (Based on Device)
1. Android
Most devices: Press Power + Volume Down simultaneously.

Samsung devices (with gesture): Swipe your palm across the screen (if enabled in settings).

Screenshots are saved in the Screenshots folder of your Gallery/Photos app.

2. iPhone
iPhone with Face ID: Press Side button + Volume Up.

iPhone with Home button: Press Home button + Power button.

Screenshots are saved in Photos > Albums > Screenshots.

3. Desktop (Windows)
Press PrtScn to copy the entire screen to clipboard, then paste into an app like Paint.

Or use Windows + Shift + S for the Snip & Sketch tool.

4. Desktop (Mac)
Press Command + Shift + 4 to select part of the screen.

Or Command + Shift + 3 to capture the full screen.

🔒 Does Telegram Prevent Screenshots in Private Channels?
Telegram Channels (private or public) generally do not restrict screenshots.

However, Secret Chats (used in 1-on-1 messages, not channels) do disable screenshots and notify the other person if you try.

✅ Summary
You can take screenshots in private Telegram channels freely using your device's standard screenshot method.

Telegram does not notify anyone if you take a screenshot in a private channel.

Only Secret Chats have screenshot restrictions.