I installed ipad photoshop. Why can’t I create a new file?

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Photoshop for iPad is not availabe in China: https://helpx.adobe.com/photoshop/using/photoshop-ipad-faq.html#IsPhotoshopontheiPadavailableinmycountry
Any Photoshop subscription that you purchase from the App Store is managed by Apple through your iTunes account. You can cancel your subscription using the App Store app on your iOS devices.
For billing issues or a refund, see Apple documentation for Request a refund for an App Store or iTunes Store purchase.
If through Adobe, see: https://helpx.adobe.com/manage-account/using/cancel-subscription.html
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