Printing Envelop issue
I can print a letter but not an envelop. I fill in the address details, format it, etc. but it does not show up on the preview. Nor does it print.
MacBook Pro 13", macOS 10.15
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What app are you printing from? If the thumbnail is blank, that sounds like the content - maybe the font? - is causing the problem. You could try changing the font or using a different printer, but sending feedback to Apple would be helpful: