In iTunes connect website, I went to upload a new version of my iOS app and I noticed there is an empty placeholder for the app icon.
I would assume that it doesn't make sense for developers to have to upload a new app icon with every version.
How can we just use the old app icon?
I found out that Apple now forces app icons to not have transparencies.
My icon contained Alphas.
I had to remove alpha by doing a File->Export from Mac Preview by unchecking alpha and uploading the exported .png to iTunes Connect.
The transparency could be the reason why the icon was removed, because I have used this icon during many updates before, but Apple no longer allows icons with transparency.
As stated in this StackOverflow post.
