Cannot install Modules via FTP

[nick7777]

I cannot install a module via FTP (it works via XML).

The documentation says I just have to upload it (unzipped) to the "modules" folder, then go to "extensions-->modules" to install.

But it doesn't show up under "extensions-->modules", though it's definitively uploaded into the correct folder "modules", where the other (already installed) modules are.

What am I doing wrong?

cmsms 1.3
the module is "G2mod"

Edit: Or should I upload it to the "plugins" folder? It is only 1 function.

Confused 

[Nullig]

Yes, that one is a plugin, not a module - so you would upload it to the plugins folder.

Nullig