Hi, please make sure that you have already grabbed the latest version of exception template 1.8 and TZ Portfolio component 3.3.7
If they are already latest, pls add new ticket and send us admin account, we will help you check
I checked and realized that your component TZ Portfolio hasn't been updated yet. Please download and install the latest version 3.3.7. Link download
Remember to back up your site before update anything.
I tested to attach a file to a portfolio article, it shows normally now. Because you didn't add any block in layout builder of template style, so attachments couldn't display properly. You can change attachment position by going to "admin > components > Tz Portfolio > template style > layout > column "attachment"