Complete Server name when connecting QNAP to NetDrive3

Hi, I wish to connect my QNAP to NetDrive3. When I I enter the link https://.myqnapcloud.com:5001 directly in the browser, I will be directed to my files on the NAS. But when I try to enter this information in the “Connect”-window of NetDrive3, I always get the message “Connection failed - Please check the connection information”.
Perhaps the port number is wrong or placed at a wrong position? But the port no. (5001) is displayed within the WebDAV-page of QNAP’s control panel.
What exactly do I have to enter? Where (else) can I find the information?
Thank you so much.

To help us diagnose the issue:

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Please be aware that the log file does not contain any login credentials. We apologize for any inconvenience this may cause.

nd3svc.zip|attachment (3.7 KB)

I hope this is the right thing. Thanks for your help.