Attachments disappear after reloading/saving/updating the page (or error "File type not permitted or mime type does not match")Issue When the user drags and drops the attachment into a form (i.g. incident form), the attachment seems to be attached because it can be seen in the header. However, when the form is reloaded/saved, the attachment disappears. When the user attempts to attach the same attachment using the attachment icon, the user gets the error message "File type not permitted or mime type does not match the file content" Attachment icon:Error message: ReleaseKingstonCauseMIME-type not synchronized with the actual file name: mismatch amongst the file extension and MIME type of the file that is attempting to be added to the instance. Thus, for instance, the file itself may be internally represented with a MIME type of .pdf but the file extension as part of the filename itself, is showing as .rtf. ResolutionIf the internal file type is known, the file extension should be changed to the proper file type representing that file. Compress the file: .zip extension is often included in the allowable file extensions. Thus, compressing the file (which will result in a file with a .zip file extension) and then attaching the compressed file should allow the file to be attached as needed.If for some reason, this option needs to be disabled, it can be done, by a System Administrator from the Security Properties page on the instance. Log in to the instance with an account having admin rights to the instance.Using the Menu Navigator, browse to the following location on the instance: System Properties-> Security.From the Security properties page that appears, locate the property which has the heading of "This property must be set to activate MIME type checking for uploads (All version Eureka and up). Enables (true) or disables (false) mime type validation for file attachments. File extensions configured via glide.attachment.extensions will be checked for MIME type during upload." This is a boolean property. Thus to de-activate the property ensure the checkbox shows as unchecked (set to a value of No). To recheck the property reset the property (ensure the value shows as checked). After setting the property to the necessary value, click the Save button at the top or bottom of the page. The default setting for this property on an out of box instance is No (unchecked). (Note that this adjustment could also be made directly from the sys_properties record for this property. The name of the property is glide.security.file.mime_type.validation. The property is stored in the instance as a true/false property, so the value can be turned on by selecting true and turned off by selecting false.) Related LinksKB0718011 - Error message received when attempting to add attachment to a record on an instance