Check that :
- in global parameters, directory for import is "../files/import"
- in global parameters, delay for import is defined and you waited for the corresponding delay
- your files respect expected syntax (CLASS_Timestamp.csv)

Attached is a picture of my global attitudes.
The value of directory for import is "../files/import"
The value of delay is 60 seconds, and I wait much more time.

I tried two types of files.
Ticket_20200211_171442.csv
Ticket_20200211_171442.xlsx

Just have a try :
- clear log file
- stop Cron
- restart CRON
- Wait a few minutes
- get Log file
- post log file here.

Hello,

here ist the log file.

Regards
Juergen

There is absolutely no trace of import in the log file.
Make sure the directory defined for import isd readable for php user, and that php user has read access to import files.

It works.

Thank you.