- Go to "WordPress Dashboard > WPML > Settings > Media Translation".
- Make sure that all the enabled checkboxes there are checked.
- Click the "Start" button.
- Wait for the process to finish.
See if it fixes the issue. If not, I'd appreciate it if you could give me the URL/User/Pass of your WordPress dashboard after you make sure that you have a backup of your website.
It is absolutely important that you give us a guarantee that you have a backup so if something happens you will have a point of restore.