iA Writer for Android includes flexible file management from within the Library:

  • Create a new document or folder by tapping the New menu
  • Open an existing document by tapping it
  • Rename, move/transfer*, or delete a document by tapping and holding the document’s name
  • Change the currently viewed storage by tapping the top-center menu

*Note: Move changes a file’s location within the file hierarchy of one storage medium. Transfer moves it between storages (e.g., Documents → Dropbox)