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Field in CMS pull to custom attribute on button

Hey. I am in the process of implementing memberstack with webflow. I have one problem due to which I can not launch.

Memberstack need add custom attribute with Membership Plans id on submit button. And in his tutorial they edit manual this field. But i must generate this page from CMS and i have not be able to edit manual.

I think i need add this field in CMS which pull on custom attribute. I find this feature on wishlist on this forum. But may be anybody know any version?

mission complete. i added button from element Embed and add field from CMS.