Trying to have invoice narrative on project downloads. Can anyone help?

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Hi all,

I've been trying to change the data shown on a project activity download to show the narrative of sales invoices, rather than a small amount of relevant, but not necessarily descriptive detail. Currently, the small amount of detail will give us the project number and name, or the header of the invoice, pulling from the Description field, as below

Is there anyway of getting the Projects report to pull from the Details section instead? I've tried myself to find the correct field, but to no avail, Does anyone know which field I can pull this info from?

Thanks in advance