How to add Upload File Button in /account/orders page

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Hye.. i need help. i try to make button to upload payment receipt for manual transfer.. here example i found..

at /account/orders page

and this result show at /admin/order dashboard with same order number


every different order number, their customer will attach their own receipt, and result at /admin/order dashboard also will display what was attach in /account/orders page.. how may i do this... i only understand this is "attachment-wrapper" but i dont know the full script.. please advice me.. tq!