Also in the settings, in Data and Storage I've switched off everything to avoid downloading every bullshit automatically. In most cases the GIFs and pictures are only wasting storage of your device but in some cases (malware) I would rather be safe than sorry and advise everyone to switch off automated downloads:
Just to be clear, there's no such thing as an automatic file
(.exe) download in Telegram. Malware or any viruses mostly come in .exe file
(or .apk for Android phones). If a user is active in groups, it's best to have this feature ON as they will need to click all images just to check what are those. They can set the size limit to a minimum. And it's not really a literal DOWNLOAD but just a small cache of it will be saved on the phone. Still, users need to click the
"Save" before it will really end up on consuming the actual phone's storage.
But yes, I agree that it's better turned off those GIF and videos and just checked it manually if interested to see what are those.
At the end of the day, it's on our own hands to make sure everything is safe. Newbies or any users should always be cautious when clicking random links they will encounter on chat groups or channels and don't save random files in the phone.