Not possible to copy source mq4 file to /Expert folder on MT4 Platform on a MACBook



I have downloaded EA Source and I am trying to copy it into my MetaEditor.

Mr process is:

1. Click on File on MT4 ; 2. Click on 'Open Data Folder'  ; A File Explorer window is opened.  ;  Click on MT4 ; Click on Experts Folder ;  Click in window, double tap, Click on PASTE.

At this stage of the game nothing happens. If I go to my DESKTOP, I can PASTE for file, If I go to NOTES, I can PASTE the file.

Only in File Explorer on my MacBook, is it not possible??

Anyone have a solution for me.

Many thanks.