A teacher gave us the definition of biotechnology in primary school, something like "using living organisms to make products or services".
I asked if ploughing a field with a horse-drawn plough is biotechnology and was told off for having a piss. It was a genuine question and I still don't know.
Since it's end to end encrypted, Ente just sees some raw bytes, it has no way to tell if what you uploaded is an image or not. So in practice it supports whatever the client can display, so your browser for the web version.