I am trying your plugin to buy it for a client of mine.

Now I am making a printing option and I am trying to add a "default field" with these settings:
- Data type: custom input

- Input type: upload

... but when I hit on update the field reverts back to:

- Data type: Multiple option

Is this a limitation of the free version or it's a bug? ... or I have not done the right things?

Thank you,