Configurable List - Dropdown with Checkbox field support

I need the checkboxes on my form to be in a dropdown i.e. instead of them being a checkbox, it would be a drop down, but the options appear as a checkbox so the user can select multiple images they would like to print.

In addition to them selecting multiple images, they may want to choose images accross albums and as such the add feature would work perfectly, but the more albums they would add; because of the long list of image numbers, it may become complicating.

Please help

Unfortunately, the configurable list widget does not support a dropdown with checkboxes field type. Supported field types can be found in the next guide:

How to Set Up the Configurable List Widget

Thank you.