first try create CSS classes like .color-red, .color-blue, and .color-green with the desired color styles.

Then, in your controller, make sure you correctly assign the status using .includes() instead of .contains(), like this: self.clientStatus = self.filesToUploadClientStatus.includes(WAITING_FOR_UPLOAD) ? 'OK' : 'Error';.

lastly, in your HTML, use ng-class to conditionally apply the color classes based on the status, so the color updates automatically when the status changes.