In Schoolbox you can add files to pages and have them displayed in the files component. However, if you want to give a direct link in a body of text to the file or create a tile that directs you to a file in Schoolbox you can do this too.
1. Navigate your way to the resources area.
2. Navigate your way to where the file is located.
3. Click on the file.
4. Click 'Properties'.
5. The direct link to the file will appear for you. You can now use this link in text and in tiles.