Error message "File type not permitted or mime type does not match the file content." when uploading file.Description First, check if there are any restrictions on file type uploads. Navigate to System Properties -> All Properties.Search for 'glide.attachment.extensions'.Under the 'Value' field, if this is empty, all file types are permitted to be uploaded.If the 'Value' field contains some file types, only these file types are permitted. You can then edit this and add your problematic file type. If the above has been checked and the issue still persists, the issue is with MIME type checking. What is MIME type checking? When an application searches for the MIME type of a file, the application checks the filename against the MIME information files. If a match for the filename is found, the MIME type associated with the extension or pattern is the MIME type of the file. You can disable this security feature by following the below steps - Navigate to System Properties -> All Properties.Search for 'glide.security.file.mime_type.validation'.Set the 'Value' to 'false'.You will now be able to upload your problematic file type.