How do I enable/disable Lumin as the default PDF viewer from my Google Drive?

When you connect the Lumin app to Google Drive, you can select Lumin as your default viewer for easy viewing, and, annotation of PDF documents.

Enabling as Default: 

1. First, ensure you have installed the Lumin app to your Google Drive. Find out how here


2. Go to your Google Drive: 


2. Click 'Settings'
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3. Click 'Manage Apps'

4. Find Lumin

5. Next to the Lumin app, to the left of "Use by default," check the box.
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Disabling as Default: 

To disable Lumin as the default app follow the above steps, and ensure that in Step 5 the box is unticked