(5) Several apps on the market today allow users to post documents and uploading files into an online folder. (6) The users can then access these files on any Internet-connected device. (7) Not only that, but the files can be shared . (8) If one person saves a change to a document, everyone else with access to the file will see the change immediately. (9) This kind of app allows students to work together on a project; they can share responses to class material and comment on classmates' work, even after they leave the classroom. Read this sentence from “ Apps for the Classroom” (5) Several apps on the market today allow users to post documents and uploading files into an online folder. How can the underlined part of the sentence be revised to create parallel structure? Several apps on the market today allow users to post documents and files into an online folder. Several apps on the market today allow users to post documents and to files into an online folder. Several apps on the market today allow users posting documents and uploading files into an online folder. There are no changes needed to the original sentence.