To do this, we go to Administration, Development tab, Model Editor sub-tab and select the Ticket class in the My Entity Types module. Then we click on the Attributes tab on the right and click on the Burger menu there.

Extending the ticket with images

We select the option "New reference..." from the burger menu.

We enter images as ID and enter the labels in German and English. We activate the options "multiple values", ordered and "allows multiple naming" and open the selection dialog for type and select gallery image as type.

Extending the ticket with log files

We select the option "New property..." from the burger menu.

We enter attachments as the ID, enter the labels in German and English, open the selection dialog for Type and select Binary as the type.

Under Customizations we select the option "File Filter for File Upload Dialog" and enter *.log under "Accepted File Types".