This could happen very easily — when you use an outdated web browser app on the fridge and visit a compromised or malicious website, it could infect your fridge. (howtogeek.com)
With your file browser app installed, simply navigate to the folder that contains the media files that you don't want to see anymore. (android.gadgethacks.com)
I sincerely missed the Chrome browser app, which I use on every other device. (laptopmag.com)