Administrators can remove an attachment by uploading a control file asynchronously.
The following lines show a control file that removes an attachment from a document:
<?xml version='1.0' encoding='utf-8'?>
<controlFile>
<resources>
<resource>
<filePath>path_to_the_document_to_be_updated</filePath>
<attachments>
<attachment>
<originId>origin_id_of_the_attachment_to_delete</originId>
<isAttached>false</isAttached>
</attachment>
</attachments>
</resource>
</resources>
</controlFile>