- Long-press on a document or tap on "Edit" at the bottom right to enter the edit mode
- Select the document you want to copy
- Tap on the Copy-button at the bottom (which is the third button from the right)
- Select the destination where you want to save the copy
- 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.