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I am trying to update my website. I have filled in all the information exactly as the last time I updated and it gives me the message that the publish was successful. However, there are no changes, even when I clear my browser history. Please help.

Have you cleared your cache by using Ctrl+F5?

You are to clear browser cache and not the browser history.

Are there any errors in the publish log (with set log level to 'all')?
Did you publish to the same folder?
Did you check if the update files are on the server?

Note that if you are using the same settings and nothing else has changed then it's usually a server related issue.
The only way we can help if you provide more details.