first commit

wp-content/plugins/sitepress-multilingual-cms/classes/media/duplication/AbstractFactory.php

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+<?php
+
+namespace WPML\Media\Duplication;
+
+abstract class AbstractFactory implements \IWPML_Backend_Action_Loader, \IWPML_Frontend_Action_Loader {
+	/**
+	 * @return bool
+	 */
+	protected static function shouldActivateHooks() {
+		return \WPML_Element_Sync_Settings_Factory::createPost()->is_sync( 'attachment' );
+	}
+
+}

wp-content/plugins/sitepress-multilingual-cms/classes/media/duplication/Hooks.php

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+<?php
+
+namespace WPML\Media\Duplication;
+
+use WPML\Element\API\IfOriginalPost;
+use WPML\FP\Fns;
+use WPML\FP\Relation;
+use WPML\LIB\WP\Post;
+use WPML\LIB\WP\Hooks as WPHooks;
+use function WPML\FP\pipe;
+use function WPML\FP\spreadArgs;
+
+class Hooks {
+
+	public static function add() {
+		WPHooks::onAction( 'update_postmeta', 10, 4 )
+			   ->then( spreadArgs( Fns::withoutRecursion( Fns::noop(), [ self::class, 'syncAttachedFile' ] ) ) );
+	}
+
+	public static function syncAttachedFile( $meta_id, $object_id, $meta_key, $meta_value ) {
+		if ( $meta_key === '_wp_attached_file' ) {
+
+			$prevValue = Post::getMetaSingle( $object_id, $meta_key );
+
+			// $isMetaSameAsPrevious :: id → bool
+			$isMetaSameAsPrevious = pipe( Post::getMetaSingle( Fns::__, $meta_key ), Relation::equals( $prevValue ) );
+
+			IfOriginalPost::getTranslationIds( $object_id )
+						  ->filter( Fns::unary( $isMetaSameAsPrevious ) )
+						  ->each( Fns::unary( Post::updateMeta( Fns::__, $meta_key, $meta_value ) ) );
+		}
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/media/duplication/HooksFactory.php

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+<?php
+
+namespace WPML\Media\Duplication;
+
+class HooksFactory extends AbstractFactory {
+	public function create() {
+		if ( self::shouldActivateHooks() ) {
+			return [ Hooks::class, 'add' ];
+		}
+
+		return null;
+	}
+}

wp-content/plugins/sitepress-multilingual-cms/classes/media/duplication/class-wpml-media-attachments-duplication-factory.php

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+<?php
+
+class WPML_Media_Attachments_Duplication_Factory extends \WPML\Media\Duplication\AbstractFactory {
+
+	public function create() {
+		if ( self::shouldActivateHooks() ) {
+			return \WPML\Container\make( WPML_Media_Attachments_Duplication::class );
+		}
+
+		return null;
+	}
+}