How to make attachment mandatory while updating a document record

Summary:

We have the minimum attachment set to 1 for a document type and the multiple occurrences for the document is set as No.

User creates the document record, atleast one attachment check is triggered. When user tries to update the same document record which already has an attachment that was attached previously, no validation is triggered.

Is it possible to trigger the validation to provide a new attachment while updating the document record ?

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25A

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