Does anyone has issue with PDF preview in LEX? The PDF attachment can be previewed correctly in Classic, but in LEX, the format is massed up when preview. There is a known issue created but not able to vote/follow and the status is 'NO FIX'?
https://success.salesforce.com/issues_view?id=a1p3A000000ejvaQAA
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We've also experienced this issue, and have yet to find a workaround, other than downloading the PDF file to your computer and opening it with a PDF reader.
