how to create a cron job on the EX4100

Hello Jedinite, sorry if I answer so late but I have not had time, it would be really nice of you to be able to edit the file for me. The command I would like to insert, I tried from the console but I could not make any changes, is to be able to create a small file in any default folder of the nas that is then updated by the same nas every minute. A user has succeeded from the console but after making changes (with the crontab -e command) I can not save and exit as a result. If I can, I’ll attach this user’s link.
I tried to load the file but it does not recognize the extension and therefore prevents me from loading it … solutions?
Thank you for your time