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You need to go to Lightroom's preferences and go over to the Lightroom Mobile tab on the top and then press Alt (windows) OR Opt (mac) to enable the Generate Diagnostic Log button. Once you hit that button, lightroom will generate a log file and you can send that file to the Adobe engineer.
Thanks for your response. Do you have an address of adobe engineer?
I don't know how to send the diagnostic log.
thanks. I have sent him a link to dropbox file.