PiPO M8 pro - Manual (Page 23)

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Just tap to choose the PDF file from your tablets, make sure
you have those files in your tablets.
If you want to make note or want to sign on pictures, Please tap
. You may edit the documents and pictures as you want.
VII. Settings
Tap the ―Settings‖ icon to go to settings. You can check and set
wireless&networks, sound, display, storage, Battery, Accounts &sync, security,
language, date&time, about tablet, etc.