No support for groupable type fields (e.g. repeater) or a hierarchical structure in acf in general.

[ironland]

The importer doesn't yet have support for fields that contain sub fields. This makes it hard to save for instance repeater fields or group fields.

A proposed solution is to create a recursive method inside save_acf that gets called on each iteration of the acf_field array and calls itself again whenever there's a field that has a groupable type.

Group and repeater fields also have to be handled differently. The proposed way should probably be this: https://www.advancedcustomfields.com/resources/update_sub_field/