1. Long-press on a document or tap on "Edit" at the bottom right to enter the edit mode
  2. Select the document you want to copy
  3. Tap on the Copy-button at the bottom (which is the third button from the right)
  4. Select the destination where you want to save the copy
  5. Tap on 'Copy to <Folder Name>'

This function can be used if you want to edit the document, but still want to keep the original file.

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