file.php

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<?php
if (!empty($vars['value'])) {
    echo elgg_format_element('div', [
        'class' => 'elgg-state elgg-state-warning',
    ], elgg_echo('fileexists'));
    
    unset($vars['value']); // the value attribute isn't supported for file inputs
}

$vars['class'] = elgg_extract_class($vars, 'elgg-input-file');

$defaults = [
    'disabled' => false,
    'type' => 'file'
];

$vars = array_merge($defaults, $vars);

echo elgg_format_element('input', $vars);