Updated on Windows 10 to build 20211017105130. Started composing a message. Added a PDF attachment. Double-clicked on it to open it and was asked what application I wanted to use. Cancelled that dialog, saved the message as a draft and checked that my Daily was set to use the built-in PDF viewer, which it was, but I clicked the Action drop-down to see what other choices there were. Left it at the "Preview in Daily" action and closed the Settings tab. Tried opening the attachment again, and it opened in the PDF Viewer tab. Tested with a second message, and it appears I need to save the message as a draft, before Thunderbird will open it in the viewer tab. Otherwise, I am asked what application I want to use if I just have the composition window open.
Bug 1734428 Comment 11 Edit History
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Updated on Windows 10 to build 20211017105130. Started composing a message. Added a PDF attachment. Double-clicked on it to open it and was asked what application I wanted to use. Cancelled that dialog, saved the message as a draft and checked that my Daily was set to use the built-in PDF viewer, which it was, but I clicked the Action drop-down to see what other choices there were. Left it at the "Preview in Daily" action and closed the Settings tab. Tried opening the attachment again, and it opened in the PDF Viewer tab. Tested with a second message, and it appears I need to save the message as a draft, then open with `Edit`, before Thunderbird will open it in the viewer tab. Otherwise, I am asked what application I want to use if I just have the composition window open.