Select the report and sheet you wish to connect. Leave Use first row as headers checked.
Click Add, then click Add to Report.
Verify and Edit Your Data
Select Manage added data sources under Resource.
Click Edit next to the spreadsheet.
Verify each field has the correct label and type. If needed, modify the field type. Select the arrow and choose the correct type from the drop-down menu.
Use Your Sheet in Charts
Select your spreadsheet under Data Source to use it in a chart.