Thank you for your question.
FMC640 devices do not have an option to capture log files through configurator.
To get an application and manual for capturing logs on FMC640 device please reach out to your sales manager/distributor. If you don't have any contacts with our Sales managers, please contact them on our official website https://teltonika-gps.com/
and click on the "Contact Us" button. When you will click, please fill the form and submit it.