Yes, we have templates that we continually refine (adding tasks and changing estimated hours). We need to export these templates as CSV files to then evaluate the estimated hours and costs in Excel. We may tweak the hours in Excel and the re-import the project as an updated template.

Adding more context. If you are a member of a project template you are not able to export the Gantt out (as PDF or otherwise, the export option doesn't show), but if you are viewing a public project template and are not a member of it then you can export the Gantt chart out.