The length of `purpose` in `StagedContent` is 64. The previous code used the legacy content key. So if the library had a very long key, an error occurred. The new code uses the `pk` instead of the `key`
The length of `purpose` in `StagedContent` is 64. The previous code used the legacy content key. So if the library had a very long key, an error occurred. The new code uses the `pk` instead of the `key`