Use Trusted QSL to sign the exported file.
Select the signed file and click "Upload". It will be sent to LoTW for processing.
Important Log files must have the file type .tq8
Cloudlog will use the LoTW username an password stored in your user profile to download a report from LoTW for you. The report Cloudlog downloads will have all confirmations since your last LoTW confirmation, up until now.