Restrict max files uploaded based on user selected package for WP Job Manager Field Editor

functions.php

<?php

add_filter( 'submit_job_form_fields', 'smyles_custom_max_images_per_package', 101 );

function smyles_custom_max_images_per_package( $fields ) {

	$max_packages = array(
		// The key should be the ID of the product (look at the ID when editing the product in the URL bar)
		'11111' => array(
			// Array key should be the exact meta key
			'main_image'   => 1,
			// Another example meta key
			'job_file_upload' => 1,
		),
		// So below, the product ID is 22222
		'22222' => array(
			'main_image'   => 2,
			'job_file_upload' => 2,
		),
		'33333' => array(
			'main_image'   => 3,
			'job_file_upload' => 3,
		),
		'44444' => array(
			'main_image'   => 4,
			'job_file_upload' => 4,
		),
	);

	$product_id  = isset( $_REQUEST['wcpl_jmfe_product_id'] ) ? intval( $_REQUEST['wcpl_jmfe_product_id'] ) : '';
	$job_package = isset( $_REQUEST['job_package'] ) ? sanitize_text_field( $_REQUEST['job_package'] ) : $product_id;
	$job_id      = isset( $_REQUEST['job_id'] ) ? intval( $_REQUEST['job_id'] ) : FALSE;

	// Product/Package Handling, get job_package from post meta
	if ( $job_id && empty( $job_package ) && class_exists( 'WP_Job_Manager_Field_Editor_Package_WC' ) ) {
		$job_package = WP_Job_Manager_Field_Editor_Package_WC::get_post_package_id( $job_id );
	}

	if ( ! empty( $job_package ) && array_key_exists( $job_package, $max_packages ) ) {

		// Example "job_file_upload" max uploads
		// Uncomment code below to enable for example meta key
		//if ( array_key_exists( 'job', $fields ) && array_key_exists( 'job_file_upload', $fields['job'] ) ) {
		//	$fields['job']['job_file_upload']['max_uploads'] = $max_packages[ $job_package ]['job_file_upload'];
		//}

		// main_image max uploads (the Listable main_image is under the company fields, not job fields)
		if ( array_key_exists( 'company', $fields ) && array_key_exists( 'main_image', $fields['company'] ) ) {
			$fields['company']['main_image']['max_uploads'] = $max_packages[ $job_package ]['main_image'];
		}
	}

	return $fields;
}

functionsv2.php

<?php

add_filter( 'submit_job_form_fields', 'smyles_custom_max_images_per_package', 101 );

function smyles_custom_max_images_per_package( $fields ) {

	$max_packages = array(
		// The key should be the ID of the product (look at the ID when editing the product in the URL bar)
		'11111' => array(
			// Array key should be the exact meta key
			'main_image'   => 1,
			// Another example meta key
			'job_file_upload' => 1,
		),
		// So below, the product ID is 22222
		'22222' => array(
			'main_image'   => 2,
			'job_file_upload' => 2,
		),
		'33333' => array(
			'main_image'   => 3,
			'job_file_upload' => 3,
		),
		'44444' => array(
			'main_image'   => 4,
			'job_file_upload' => 4,
		),
	);

	$product_id  = isset( $_REQUEST['wcpl_jmfe_product_id'] ) ? intval( $_REQUEST['wcpl_jmfe_product_id'] ) : '';
	$job_package = isset( $_REQUEST['job_package'] ) ? sanitize_text_field( $_REQUEST['job_package'] ) : $product_id;
	$job_id      = isset( $_REQUEST['job_id'] ) ? intval( $_REQUEST['job_id'] ) : FALSE;

	// Product/Package Handling, get job_package from post meta
	if ( $job_id && empty( $job_package ) && class_exists( 'WP_Job_Manager_Field_Editor_Package_WC' ) ) {
		$job_package = WP_Job_Manager_Field_Editor_Package_WC::get_post_package_id( $job_id );
	}

	if ( ! empty( $job_package ) && array_key_exists( $job_package, $max_packages ) ) {

		foreach ( (array) $max_packages[ $job_package ] as $meta_key => $max_value ) {
			
			if( isset( $fields['job'], $fields['job'][ $meta_key ] ) ){
				$fields['job'][$meta_key]['max_uploads'] = $max_value;
			}

			// Also check in company fields for the meta key field
			if ( isset( $fields['company'], $fields['company'][ $meta_key ] ) ) {
				$fields['company'][ $meta_key ]['max_uploads'] = $max_value;
			}
		}
		
	}

	return $fields;
}

The second example file functionsv2.php does the same exact thing, except that one will check for the field in job and company fields and set the max uploads value (the first one functions.php you specifically tell it which files to check)

Here's an example of doing this just for gallery_images field:
https://gist.github.com/tripflex/c3cabb264ae00867a71dbb461dfd6303