I got it. Let me clarify the example. It's only a demo to show how to access the asset of the photo library through the file path. if I need to edit this asset, I can access it through the PhotoKit API and then call the method below to write it to my app's sandbox.
[[PHAssetResourceManager defaultManager] writeDataForAssetResource:targetResource
toFile:url
options:options
completionHandler:^(NSError * _Nullable error) {
}];
yugu
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Everything is good. Thank you for the reply～