When on a recruiters website and i either press 'upload CV' or 'click here' my Mac will not open my files to let me attach my CV or any other files.

Thanks for posting in the Apple Support Communities Notsotecsavy,

If you haven't yet, try dragging and dropping the document into the field on the web form.

If that doesn't work, providing additional information about your Mac, and contact such as the type of file you're working with, may increase the chance that more community members will be able to provide a helpful response.

Cheers!