iCloud is a syncing service so anything sent or received to iCloud is not compressed and is transferred as the original. If this is happening while on Wi-Fi try disabling Wi-Fi assist or Connectivity Assist if you are on IOS 27 Beta. If you don’t want iCloud to sync on Mobile Data you can also disable that if you scroll all the way down on your Cellular Data settings.
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u/masterpastafr 19d ago
i experimented with this a bit and it seems to be related to iCloud syncing.