To move files between folders, just follow the steps below.

  1. Press Select. iPhone showing PDF Pro library with Select button highlighted
  2. Select the files you want to move to a folder. iPhone showing PDF files selected for moving
  3. Tap on Move. iPhone showing toolbar with Move button highlighted
  4. Select the folder where you want to move the files. iPhone showing folder selection dialog for destination
  5. Tap on Move. iPhone showing Move button to confirm the move action
  1. Press Select. iPad showing PDF Pro library with Select button highlighted
  2. Select the files you want to move to a folder. iPad showing PDF files selected for moving
  3. Tap on Move. iPad showing toolbar with Move button highlighted
  4. Select the folder where you want to move the files. iPad showing folder selection dialog for destination
  5. Tap on Move. iPad showing Move button to confirm the move action

Alternatively you may also move files between folders via Drag&Drop.