after confirming; upon verification
A formal phrase used in business or official contexts to indicate that an action will be taken only after checking or verifying something. Often used in requests or instructions.
Please reply after confirming the contents.
After reviewing the documents, please sign them.
A set phrase combining 確認 (confirmation) + の (possessive particle) + 上 (in the context of 'after' or 'upon'). The use of 上 here is a formal grammatical pattern meaning 'after doing something'.