Uploading a new version of the attachment through the update form?

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I have this approval workflow, where an employee uploads a pdf for approval, if there is comments from his manager he needs to upload a new version, but I dont want him to have access into the sheet, I only want him to use the update form he receive via email, however there is no option to upload a new version of the attachment from


there, Also if i upload with the same file name, it doesnt combine them it will upload it twice


Please let me know if I am missing anything?

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