vendor/magento/framework/Image/Adapter/Gd2.php:64
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解决方法：
修改文件
vendor\magento\framework\Image\Adapter\Gd2.php
从
if (!$filename || filesize($filename) === 0 || !$this->validateURLScheme($filename)) {到
if (!$filename || filesize($filename) === 0 ) {
