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As side-note, you can also do it without CSS – that’s something you could achieve with slots: https://quasar.dev/vue-components/uploader#Slots by customizing the header.
More verbose though, but I guess cleaner in a way.
Not a pro, but am I wrong or you are not using SSR mode? Dynamically changing the meta makes sense only with SSR.
You said you’re using PWA, you might need to check the doc about running SSR + PWA.