You can create a new entity which inherits from System.FileDocument (let's call it "WordFile"). Add an enumeration to WordFile where an admin can select if the file will be downloaded using button one, two or three. Add an upload page where an administrator can upload the three different word files, and can select if this file will be connected to button one, two or three. Use the File Manager widget for this. Here's a link to the file manager documentation: https://docs.mendix.com/refguide/file-manager/