Replace the file in a document
When you need to update a document that is controlled in Toolbox as an uploaded file, you'll need to edit the document to replace the file with a new version.
Find the document in Toolbox and open up the document view (click on the document in the register). Go to the draft tab (if you can't see the draft tab, then you don't have permission to edit the document)
Click on the pencil icon to the right of the file you want to replace.
In the 'Edit file' window, click on the 'File' button and choose the new file. Click on 'Save'. This will replace the file in the draft document.
Remember to update the revision information to describe the changes. The revision date / number needs to match what is shown on your document.
If you're ready to release it, go through the workflow steps so that everyone can access the new version.