title: Why the wordpress theme uploaded in zip is treated as new instead of triggering update?
body: <p>So I have a wordpress theme I'm working on. When I deploy the theme to the server I pack it into a zip and upload using WP admin. Assuming this theme is already installed I expect an update to happen but WP treats it as new and proposes to activate the uploaded theme. What am I doing wrong?</p>
  <p>Unfortunately, I have no (s)FTP or SSH access to the server.</p>
  <p>It is worth mentioning that metadata in <code>style.css</code> is the same (hence theme name, author etc).</p>
  <p>WP version is 6.0.2</p>
  <p>Thanks in advance.</p>