1. Make sure you have uploaded the document to iCloud properly and are logged in with the same user.
2. Have you signed in with the same apple id and enabled iCloud tab sharing on all the devices? (System preferences > iCloud > Safari)
3. Not quite sure what you are asking for, but going into Finder and iCloud on the right tab on Mac will give you a folder with your iCloud file. On iOS 11 the same can be done under the "Files" app.