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- Attempt to replace a file that does not exist in the collection.
- The user should be informed that the operation failed because the file did't exist.
Unreachable file replace
- Attempt to replace a file in the collection, providing the correct checksums, but a wrong url (the url validates, but no file is found).
- The user should be informed that the pillars were unable to locate the file at the given url.
Replace with returned checksums
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