When the Knowledge article is in 'Published' state the attachment button is visible in the instanceDescription<!-- div.margin { padding: 10px 40px 40px 30px; } table.tocTable { border: 1px solid; border-color: #e0e0e0; background-color: #fff; } .title { color: #d1232b; font-weight: normal; font-size: 28px; } h1 { color: #d1232b; font-weight: normal; font-size: 21px; margin-bottom: 5px; border-bottom-width: 2px; border-bottom-style: solid; border-bottom-color: #cccccc; } h2 { color: #646464; font-weight: bold; font-size: 18px; } h3 { color: #000000; font-weight: bold; font-size: 16px; } h4 { color: #666666; font-weight: bold; font-size: 15px; } h5 { color: #000000; font-weight: bold; font-size: 13px; } h6 { color: #000000; font-weight: bold; font-size:14px; } ul, ol { margin-left: 0; list-style-position: outside; } --> Symptoms When the Knowledge article is in 'Published' state the attachment button is visible in the instance Release All Releases Cause System Property - glide.knowman.versioning.minor_edit_fields is the property which is making the fields in the knowledge article to be editable The attachment button is visible because the two fields [valid_to,author] are editable/writable in the knowledge article even after in the 'Published' state. So, the OOB Write ACL Sys ID [20cb513cd71221004792a1737e6103dc] will not make the attachment icon in the knowledge article to be invisible for the end users. Resolution Remove both the fields from the value field in the system property - glide.knowman.versioning.minor_edit_fields Once all the fields in the KB article are read-only the OOB Write ACL make sure that the attachment button to be not visible for the published knowledge articles.