AWS S3 upload (backblaze-comatible S3 api) doesn't work with files larger ~100MB

[cyberduck]

3000015 created the issue

When using the AWS-compatible backblaze S3 endpoint as in their docs, it seems that small files upload fine and fast, but large files stall. The upload never starts, there's a message about "initializing large file upload" but then nothing happens anymore.
The download can't be stopped or removed, only quitting Cyberduck brings it back into a working state (file upload still fails).

Cyberduck is used as example integration app in the backblaze docs:
https://help.backblaze.com/hc/en-us/articles/360047425453-Getting-Started-with-the-S3-Compatible-API

I'm not sure if that's an issue with CyberDuck, Backblaze, or their S3 integration, but since Cyberduck goes into a broken / unstoppable state there's at least something wrong here.

[cyberduck]

3000015 commented

Just tested with

• the AWS SDK (no Cyberduck involved) - works fine
• the Backblaze connection in Cyberduck - works fine

[cyberduck]

@dkocher commented

Relates to #11547.

[cyberduck]

@dkocher commented

In 53792c2.