Several questions about StaticServerExample/App.tsx #105

In Example,

1. const {uri} = Image.resolveAssetSource(index)
   Why get uri in this way?
2. await FileSystem.makeDirectoryAsync(path)
   Why is it necessary to create an empty file directory, can't it be created manually?
3. added = FileSystem.copyAsync({ from: uri, to: dest })
   Why create a copy of the catalog file?

I just want to create a html project in the project that needs a static server to run. What I want to achieve is:

Project root directory www/index.html
${origin} = https://xxx/www
${file} = index.html
<WebView source={{ uri: ${origin}/${file} }} />