You can copy JanesFile.txt to the new folder (JanesOtherFolder) using the following steps.
Ensure that the setup described in the introduction to this section has been performed.
In one of the navigation views, select JanesFile.txt.
From the file's context menu, select Copy (or Ctrl+C)
From the folder's context menu, select Paste (or Ctrl+V).
As an alternative to copying files using the copy operation, it is also possible to copy files by holding down the Ctrl key while dragging a file from one folder to another folder. (On macOS, the ⌥ key is used for this.)
Once the file has been copied it can be renamed.