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Hi,
We have no particular code to force the browser to view the file instead of downloading it. Keep in mind that this is a browser setting that the user can force to « download » instead of « view » for any file type.
The enhanced files add-on will allow you to hint the browser to display the file instead of downloading it. This is all we can do.
Depending on your theme, WP Customer Area can be accessible from mobile too. Viewing PDF files on mobiles will depend on the apps installed on it (talking for Android, I don’t know about Apple)