Sheets not read

An uploaded workbook has more than one sheet with values, and a data source holds one table. The first sheet was read, or the only other sheet with a table when the first has none, and the remaining sheets were not. This is a warning.

What to do

If the table you need is on another sheet, move that sheet to the front of the workbook, or save it as CSV, and upload again.

Where it comes from

Shown by Import Data. It is one of the messages about a node.