Proper visualisation in Microreact requires a single ID column (regardless of what the column is named) that uniquely identifies each row of data in each of the related files.
if your data uses a combination of two or more columns to uniquely identify each row, then you will need to concatenate those columns into a single-column ID before importing the data.
TIP: Use Data-flo's columns-concatenation adaptor before importing the data to Microreact.
the ID values should be shared across files. IDs are the linking values that allow panels to interact with one another.