Want to upload maximum 20mb zip file.

try this

'product-zip' => 'required|mimes:zip|max:20000', 

thanks for answer but its 200mb isn't i want to validate file upto 20mb not 200mb

You have to increase php settings for max upload and max post size.

Its also helpful to say what this means

but it throw me validation error,

no its 20mb . 1mb = 1024kb so do 20mb will be round about 20000 Mb

Thanks.

So what i write in validation is correct for 20mb ?

Yes i wrote 50000 but still get error with 20mb file.

What error?

It means the validation error like below

$this->validate($request, [
	'product_zip' => 'required|mimes:zip|size:20000',
]);

but still get error the file is 16.58mb

this error

The product zip must be 50000 kilobytes.

even file is 16mb you can see here

"product_zip" => UploadedFile {#32 ▼
        -test: false
        -originalName: "stock-icon-bulb.zip"
        -mimeType: "application/x-zip-compressed"
        -size: 16285787
        -error: 0
        path: "C:\xampp\tmp"
        filename: "php8FAF.tmp"
        basename: "php8FAF.tmp"
        pathname: "C:\xampp\tmp\php8FAF.tmp"
        extension: "tmp"
        realPath: "C:\xampp\tmp\php8FAF.tmp"
        aTime: 2020-09-07 10:05:50
        mTime: 2020-09-07 10:05:5