Add QMode=1 to the Conga Batch formula field. Do not use QMode=Content (QMode=1 normally translates to a downloaded output, but is required to save a consolidated output to Content).
On the Conga Batch record, add aContent Workspace IDand selectConsolidated PDF Output File.
You must remove references to Content in theFormulafield as well because they are referenced on the Conga Batch record. This field is not on the Conga Batch record by default. To add the field, clickEdit layoutand drag the field onto the Page Layout under the Schedule section.