Unable to attach adobe indesign idml format fileIssue <!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } span { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } h2 { font-size: 24pt; font-family: Lato; color: var(--now-color--text-primary, black); } h3 { font-size: 18pt; font-family: Lato; color: var(--now-color--text-primary, black); } h4 { font-size: 14pt; font-family: Lato; color: var(--now-color--text-primary, black); } a { font-size: 12pt; font-family: Lato; color: var(--now-color--link-primary, #00718F); } a:hover { font-size: 12pt; color: var(--now-color--link-primary, #024F69); } a:target { font-size: 12pt; color: var(--now-color--link-primary, #032D42); } a:visited { font-size: 12pt; color: var(--now-color--link-primary, #00718f); } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } <!-- p.p1 {margin: 0.0px 0.0px 12.0px 0.0px; line-height: 14.0px; font: 12.0px Times; color: #000000; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} -->Symptoms It was not possible to attach adobe indesign idml files. In the UI the user gets the message: "test.idml: File type not permitted or mime type does not match the file content" In the log file the following error messages were seen: 10/30/18 11:02:58 (456) 5745691CDB616F003A32742EAF961915 Security restricted: MIME type mismatch for file: test.idml. Expected type:application/octet-stream, Actual type: application/vnd.adobe.indesign-idml-package10/30/18 11:02:58 (456) 5745691CDB616F003A32742EAF961915 Security restricted: File type is not allowed or does not match the content for file test.idml Release Kingston Cause The reason was that ServiceNow did not recognize the mime type that the file uses a valid. The customer had the system property setting:glide.security.file.mime_type.validation = true This means only files that have mime types that ServiceNow recognizes can be attached. This is documented here:https://docs.servicenow.com/csh?topicname=r_GeneralSecuritySettings.html&version=latest Resolution In order to configure ServiceNow to recognize the idml file type you need to create a new system property: name: glide.security.mime_type.extension_mapping value: idml=application/vnd.adobe.indesign-idml-package This associates the file extension idml to the mime type application/vnd.adobe.indesign-idml-package <!-- p.p1 {margin: 0.0px 0.0px 12.0px 0.0px; line-height: 14.0px; font: 12.0px Times; color: #000000; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} -->Release<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } span { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } h2 { font-size: 24pt; font-family: Lato; color: var(--now-color--text-primary, black); } h3 { font-size: 18pt; font-family: Lato; color: var(--now-color--text-primary, black); } h4 { font-size: 14pt; font-family: Lato; color: var(--now-color--text-primary, black); } a { font-size: 12pt; font-family: Lato; color: var(--now-color--link-primary, #00718F); } a:hover { font-size: 12pt; color: var(--now-color--link-primary, #024F69); } a:target { font-size: 12pt; color: var(--now-color--link-primary, #032D42); } a:visited { font-size: 12pt; color: var(--now-color--link-primary, #00718f); } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Resolution<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } span { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } h2 { font-size: 24pt; font-family: Lato; color: var(--now-color--text-primary, black); } h3 { font-size: 18pt; font-family: Lato; color: var(--now-color--text-primary, black); } h4 { font-size: 14pt; font-family: Lato; color: var(--now-color--text-primary, black); } a { font-size: 12pt; font-family: Lato; color: var(--now-color--link-primary, #00718F); } a:hover { font-size: 12pt; color: var(--now-color--link-primary, #024F69); } a:target { font-size: 12pt; color: var(--now-color--link-primary, #032D42); } a:visited { font-size: 12pt; color: var(--now-color--link-primary, #00718f); } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } }