Adding Affinity Photo 2 to External Editor

I've read the user manual and tried two different ways to use the macro to add Affinity.
1.  clicked on the ... browse button and added the macro into the file name - get error message saying the file cannot be accessed by the system - see attached file untitled
2.  Next I just pasted the macro into the next available space  in the External Editors Preferences menu to add an external programme and clicked OK. - see attached file '.Effort 2'
With my image selected, I then clicked Alt R to open the file in Affinity - nothing happens - yet when I check back on the Keyboards Shortcuts, Affinity Photo2 is now showing as an external program - see attached file '.shortcut'.
I've closed and re-opened FRV but still no joy.
Am I doing something wrong or does this macro / method no longer work.
I have the last version of Affinity Photo 2 and also have the latest Affinity from Canva downloaded, not that I have a clue how to get that to show as an external editor.
Any help appreciated and sorry if this question has been asked elsewhere