Low disk reading
My daughter has a iPhone 11 Pro Max, on her screen it keeps reading low disk, she’s deleted a lot of apps but it’s still coming on the screen
iPhone 11 Pro Max
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Some apps take up a lot more storage than others, so if you go into settings -> general -> iPhone storage you can see how much storage each app takes up and you can see which apps to delete to free up space. For more information, read the article attached below.
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
Hope this helped.