What this error means
The 1024 × 1024 App Store icon must be fully opaque. A PNG with an alpha channel is refused, even if it looks solid.
Why it happens
The 1024 × 1024 marketing icon is checked on upload. Any alpha channel, even on a pixel that looks solid, fails that check.
The message tools print
ERROR ITMS-90717: "Invalid large app icon. The large app icon in the asset catalog in "App.app" can't be transparent or contain an alpha channel."How to fix it
- Export the icon again as a PNG without alpha, flattened on a background colour.
- Replace AppIcon in ios/App/App/Assets.xcassets and rebuild.
The app icon generator writes the 1024 icon as a PNG without an alpha channel, along with every Android size.
Check a log that shows this
Paste the failing step into the build error explainer. It matches this message, and any others in the same log, in your browser. Nothing is uploaded.