Integration with Advanced Custom Fields (ACF) Image Field

We have enjoyed using your plugin for Flickr on our sites. We have several Advanced Custom Fields (ACF) setup using the ACF Pro plugin. In our fields that use images we are able to access the Flickr image libraries we setup with the RML plugin. However, upon trying to add Instagram as a new library, the only place we can access the Instagram RML is from the “Add Media” button on a post. When we try to add it through any of the ACF fields, we only see the Flickr RML.

Is there any reason why Flickr RML would be accessible in ACF image fields and Instagram RML is not?