That's quite easy. On Android, just press the Power and Volume Down buttons at the same time. If you're using an iPhone, on newer models without a Home button, press the Side and Volume Up buttons together. For older iPhones, it's the Home and Side buttons at once. Once you capture the screenshot, it automatically saves to your photo gallery.
Just keep in mind, if you’re screenshotting disappearing media or messages in a secret chat, Telegram will notify the sender. Does telegram notify screenshot?
It looks very interesting so far. I enjoyed a lot while reading this one. You can try this method to take a screenshot on Telegram. You just need to use your device's built-in screenshot feature. Though, most devices, press the power and volume down buttons simultaneously. For iPhones, press the side and volume up buttons together. If you have a Instagram account just follow this process Instagram privacy tools to watch others hidden profiles for free.