Samsung SM-T638U User Manual page 29

Apps and features
Copying and pasting
Touch and hold over text.
1
Drag or to select the desired text, or tap Select all to select all text.
2
Tap Copy or Cut.
3
The selected text is copied to the clipboard.
Touch and hold where the text is to be inserted and tap Paste.
4
To paste text that you have previously copied, tap Clipboard and select the text.
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