src/Observers/EeMediaGalleryObserver.php
protected function prepareProductMediaGalleryValueToEntityAttributes()
    {

        // initialize and return the entity
        return $this->initializeEntity(
            array(
                MemberNames::VALUE_ID  => $this->valueId,
                MemberNames::ROW_ID    => $this->parentId
            )
        );
    }
protected function prepareProductMediaGalleryValueToEntityAttributes()
    {

        // initialize and return the entity
        return $this->initializeEntity(
            array(
                MemberNames::VALUE_ID  => $this->valueId,
                MemberNames::ROW_ID    => $this->parentId
            )
        );
    }
Prepare the product media gallery value to entity that has to be persisted.

@return array The prepared product media gallery value to entity attributes