I have a new script up on GitHub for updating app metadata and screenshots using the iTMSTransporter app, which I first learned about watching the iTunes Connect: Development to Distribution WWDC 2015 video.
It uses the PHP-CLI because the built in support for XML and JSON made it easier to work with the metadata file.
It’s good to be able to have this fire and forget solution, especially as I often find myself in countries with less than stellar Internet. Rather than having to sit there and drag in screenshots and wait for refreshes and reorder them manually for 5 different devices through the web interface, I can just run this instead.
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