您必须像资产一样将图像上传到不需要预编译才能显示的文件夹.尝试将它们上传到 public 文件夹.

You have to upload images to a folder that doesn't need precompiling to be show, as assets do. Try uploading them to public folder.

此外，您可能还想了解资产管道以及它们为什么不显示:

Also you might want to read about the asset pipeline and why aren't they displaying:

http://guides.rubyonrails.org/asset_pipeline.html