As an AI language model, I don't have access to view or resolve specific issues on App Store Connect. However, here are a few general steps you could try to resolve this error:
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Check if the assets you are trying to upload meet the App Store Connect requirements. Refer to the App Store Connect documentation for more details.
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Make sure that the assets are in the correct format and size. For example, images should be in PNG or JPEG format and have a resolution of at least 72 pixels.
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Check if the App Store Connect account has the necessary permissions to access the assets you are trying to upload.
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Clear the cache and cookies of your web browser and try again.
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Try uploading the assets from a different device, a different browser, or a different network.
If none of the above steps work, you could try contacting the App Store Connect support team for further assistance.