Minus Symbol in name

Hi,

I just installed your plugin and I’m starting using it.

The names of my files are separated with the Minus Symbol “-” but when I see it from my plugin in some case the minus disappears, in other stays there.

How can I show it always?

Here you can find a screenshot of the plugin in use Screenshot
but the files in the filsystem are all with minus, like “2011-11-19-Soluzione.pdf” or “2003-02-14-Soluzione.pdf”

https://wordpress.org/plugins/file-away/