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Test steps
Enable portfolios. [Settings ► Site administration ► Advanced features] .
Next enable a portfolio plugin [Settings ► Site administration ► Plugins ► Portfolios ► Manage portfolios] I found that Box.net didn't require much work. We're not going to be exporting, so just get it enabled any way that you can.
Create a database activity.
Add a field.
Save the templates.
Go to the "View list" tab.
Check that there is no button to export entries to a portfolio.
Add an entry.
Go back to the list view.
Observe that the "Export to portfolio" button is now present.