If your customer opened the invoice that was emailed to them, the invoice status should change to "Viewed" on your Sales > Invoices page. Below I attached a screenshot for reference:
The same applies to estimates on the Sales > Estimates page like so:
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Hello @JustLinda !
If your customer opened the invoice that was emailed to them, the invoice status should change to "Viewed" on your Sales > Invoices page. Below I attached a screenshot for reference:
The same applies to estimates on the Sales > Estimates page like so: