Why compare hashes instead of file names?

Two files can have the same name with different content, or different names with identical content; a hash compares the actual bytes.

What does it mean if the hashes don't match?

The files differ by at least one byte — even a single-character change in a large file will produce a completely different hash.

Check whether two files are identical by comparing their cryptographic hash, without uploading either one.

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Why compare hashes instead of file names?: Two files can have the same name with different content, or different names with identical content; a hash compares the actual bytes.
What does it mean if the hashes don't match?: The files differ by at least one byte — even a single-character change in a large file will produce a completely different hash.