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$file = public_path('storage/images/' . $value)
if(! file_exists($file)){
return asset('storage/images/default.png');
}
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use Illuminate\Support\Facades\Storage;
$filePath = 'path/to/file.ext';
$fileExists = Storage::exists($filePath);
if ($fileExists) {
echo "The file '$filePath' exists.";
} else {
echo "The file '$filePath' does not exist.";
}