@leocg Thanks.

Opera Mobile (Android) has internal translation. I couldn't see an internal translator in the desktop Windows application alone. If so, how do we activate it?
Or which translator plugin would you recommend?

I read an article that PDF files can be opened in the Android version of Opera.
Can we do this in Opera Mobile? If we can, this does not happen with Opera installed on my Android 13 device.

https://gadgetroyale.com/open-pdf-in-mobile-browser/#:~:text=How to open pdf in mobile browser 1,Firefox mobile version. ... 3 3. Samsung browser