I created an upload form for images, which works properly and saves files in Contents/Resources/uploads.
I now want to display those images in my web app: how do I retrieve the URL?
To display a Seaside image, you'd use...
html url: <some image resource>
...if that image is in your Seaside image, the image resource can be coded as...
html url: WAFileLibrary / #myNewImagePng
...which translates as...
html url: '/files/WAFileLibrary/myNewImage.png'
Normally a subclass of WAFileLibrary would be used for your application.