Multiple key files can not be applied to a single instance of your floating license server. Flexeras floating license server and our cameo vendor daemon can support a single floating license key file at one time. 

Meaning that if you try to apply multiple floating license key files to your floating license server, one key file will supersede the other and licenses from a single key file only will be available on your server. 

The solution in case you have multiple floating license key files with our product licenses, would be to engage your assigned account/sales executive and request a single floating license key file containing all your licenses. 

Please do not try to merge multiple floating license key files into one file yourself - this will not work.