Yes, but it's not so simple as just upload your files. There's a bunch of requirements on CPAN. Module have to be a certain way. You can't just upload any random files to CPAN.

There are plenty of other sites which can act as filestores such as gitlab, github, google drive or even your own neocities site. There's no reason not to use one of those instead.

And the website should allow people to post pictures if they want to.

It already does. And you know this.