The context: I sent email to company A about the work completion form, which is ready for endorsement. However, company A asked "certificate of completion of minor works" is missing. Then, I reply:
Thank you for the reminder. We will follow-up the certificate and keep you post.
Rita Ngan Thank you for the reminder. We will follow-up the certificate and keep you post. It's "keep you posted".
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Rita NganThank you for the reminder. We will follow-up the certificate and keep you post.
It's "keep you posted". I do not know what you are trying to say with "follow up the certificate".