7. What kinds of files are viewable for mobile devices? 圖片與資料來源 https://www.dropbox.com
8. 免費與進階版本 about Dropbox and get extra space For every friend who joins Dropbox, we'll give you both 250 MB of bonus space (up to a limit of 8 GB)! 圖片與資料來源 https://www.dropbox.com