When I create a new custom field and set the type to "Gravity Forms" and set "Allow Multiple?" to "Yes" i still am only seeing a drop-down that allows for a single selection. All of the other parameters — Required, Allow null, Conditional ,etc. — work as normal. There are no obvious errors rendered on the page.
The field is being used in a field group set to appear on an Options page. I've tried moving it to other Options pages, in combination with other fields and as a standalone field. I've also tried it as part of field group that only applies to post types.
I'm using version 1.0.0 of the plugin and version 5.0.8 of ACF Pro.
Is anyone else experiencing this?