Hello,
Thanks for your support.
I have verified the nginx.conf and found no abnormality in logging section: please see below from the nginx.conf.
i can see all requests for upload requests only in the access.log, but download request not appeared.
##
# Logging Settings
##
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'bytes_send="$bytes_sent" content_length="$content_length" content_type="$content_type"
request_body="$request_body" '
'rt=$request_time uct="$upstream_connect_time" server_addr="$server_addr" request_url="$request_uri"
uht="$upstream_header_time" urt=" $upstream_response_time" rqlength="$request_length"'
access_log /var/log/nginx/access.log main;
error_log /var/log/nginx/error.log;