file.update:before

/site/config/config.php

return [
    'hooks' => [
        'file.update:before' => function (Kirby\Cms\File $file, array $values, array $strings) {
            // your code goes here
        }
    ]
]

Parameters

Parameter	Type
$file	Kirby\Cms\File
$values	array
$strings	array