feat(submit): add user media library

templates/parts/submit/sidebar-pay.php

@@ -70,7 +70,8 @@ if (!function_exists('aksrt_submit_pay_line')) {
 					<button type="button" class="flex1 name-link pay-dawnload-add-edit" data-pay-download-edit><?php echo esc_html((string) ($row['url'] ?? '')); ?></button>
 					<button type="button" class="pay-dawnload-add-delete em12 ml10 hollow but cir c-red" data-pay-download-remove aria-label="<?php esc_attr_e('删除资源', 'aksrt'); ?>"><i class="fa far fa-trash-alt" aria-hidden="true"></i></button>
 					<div class="hidden-input">
-						<?php foreach (['url', 'extract_code', 'copy_key', 'copy_val', 'label', 'class'] as $field) : ?>
+							<?php foreach (['url', 'attachment_id', 'extract_code', 'copy_key', 'copy_val', 'label', 'class'] as $field) : ?>
+
 						<input type="hidden" name="aksrt_pay[downloads][<?php echo (int) $index; ?>][<?php echo esc_attr($field); ?>]" data-pay-download-field="<?php echo esc_attr($field); ?>" value="<?php echo esc_attr((string) ($row[$field] ?? '')); ?>">
 						<?php endforeach; ?>
 					</div>