Greyed out 'Convert' button 

I am using the Logic Pro trial and although it says it is fully functional, I cannot seem to be able to convert an audio file to a sample.

The key issue is that when I right click on the audio track the option to convert is greyed out.

I have exhausted the online searches and YouTube videos over the last 3 hours and don't know where else to turn.

Any advise would be greatly appreciated.

Thanks