Clublog Upload Status value 'N'

[foldynl]

I am testing the interoperability between Cloudlog and my Log application and I am confused how Cloudlog interpretes CLUBLOG_QSO_UPLOAD_STATUS

Based on the ADIF format, the CLUBLOG_QSO_UPLOAD_STATUS values are defined:

Y the QSO has been uploaded to, and accepted by, the online service
N do not upload the QSO to the online service
M the QSO has been modified since being uploaded to the online service

if I'm not mistaken, N should have guaranteed that the record after being transferred to Cloudlog will not be transferred to Cloudlog
I am not PHP specials but I dug into the cloudlog code and it seems that function get_clublog_qsos or mark_all_qsos_notsent interpret QSO with N as QSO that will be sent to Clublog.

Is it an issue in the Cloudlog or my bad interpretation of the ADIF format?