预览带印章的那页，印章展示是不透明的，源文件是透明的，How to fix it！！！！

如果只上传带印章的那一页，预览显示是正常，但是上传源文件，翻页到第二页，印章就不透明了（印章在第二页）
Preview the page with the seal, the seal display is opaque, and the source file is transparent. If you only upload the page with the seal, the preview display is normal, but when i upload the source file and turn to the second page, the seal will be opaque (the seal is on the second page).