​Here is how to set your Siras account to recognize your computers PDF default.
Or how to try different PDF settings that work better for your computer/browser.

• Click on Tools
• Under Tools select 'My Account' or 'Manage Users' (then find your account)
• Once you are viewing your Siras account
• Click on Edit Preferences
• At the bottom left, make sure next to PDF Viewer you have 'System Default' selected
• Then click Update Preferences.

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