If you have enabled passcode lock and disabled the option to show your chats in the task switcher, screenshots will be disabled in the app.
To change this, go to Settings > Privacy and Security > Passcode lock, then enable Show App Content in Task Switcher and restart the app. You will be able to take screenshots of the app, but the system will display your chats in the task switcher even if the passcode is on.
Note: If you haven't set a passcode lock, check that you have enough space in your device’s storage to save the screenshots you take.
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