Due to cyberduck's bugs with multi-part upload (see my comment above), I uploaded my big file using s3tools (s3tools.org) from command line and it worked without any problem. My conclusion is Cyberduck seems to have some problem to upload multi-part files.
I'm trying to upload a large file to S3 (1GB).
The upload fails and resume is never enabled.
I have always to restart the upload.
The result is that I cannot upload the file.
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