DNG 格式不受支持，无法预览图片和显示缩略图

[ming4J]

Is your feature request related to a problem? Please describe. DNG 格式不受支持，无法预览图片和显示缩略图

Describe the solution you'd like DNG 格式图片能够正常显示缩略图和能够正常预览

Describe alternatives you've considered iPhone 移动端 用户大量备份照片如果开启RAW之后所有图片无法显示缩略图和无法预览

Additional context

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