@hannahm I apologize for the confusion on my end. Data linking is the enterprise-only feature that allows you to upload a data set and freely associate it with any kind of shape, as well as refresh and replace it as needed using the general data management panel (on the left). The feature I believe you are using is the Data-based org chart feature. This is the ability to create an org chart based on specifically formatted data, and has a separate (right panel) data management tool for re-uploading and refreshing data. You will need to both upload and refresh your data through this specific tool, not data linking. Automatic refresh will not work with a Data-based org chart.
Does this answer your question?