We changed the part size for multipart uploads to 10MB in 7b77f76 to allow multipart uploads up to 100GB in total size due to the maximum number of parts restriction of 10'000 by S3. Please try with the latest snapshot build available and reopen this ticket if you are still having this issue.
From my understanding you're failing at objects greater than 100GB to prevent more than 10,000 segment being created (an S3 limit).
OpenStack Swift does not have a hard upper limit on the total number of objects stored in a container.
I've been able to override the default user setting: openstack.upload.largeobject.size to 1,048,576,000 (1GB)
which is approximately the default segment size used by the Python Swift Client and increasing the Cyberduck object size limit to 1TB.
Manually editing the Cyberduck user.config xml file is a less than desirable solution for our users, who routinely upload 100GB or larger files.
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