How to @import?

Hi!
Love the plugin, variables and nesting work! However @import doesn’t seem to work?
I tried to import a _variables.scss file like so: @import: 'variables';, however for some reason I couldn’t use the variables in that file while if I made variables in the normal style.scss, it worked… Am I doing anything wrong?

https://wordpress.org/plugins/sassify/