When you update datasets on Data & Insights with a source file that has different column names you end up with a schema mismatch. To fix this:
- Select "Edit" to open a draft of your dataset for editing.
- Select "Add Data."
- Select your new data file.
- When the "Column Mismatch" warning pops up, match the name of your Dataset Column (left) with the column name in your source file (right)
- Select "Save."
- Publish your update!
From now on, Data & Insights will remember that the column named 'Surname' in your source file should be imported into the column named 'Last Name' in your dataset.