Hi @mjokela,
I’m not sure I understand the exact situation. When trying to upload a file using the interactive tutorial here https://developer.kaltura.com/workflows/Ingest_and_Upload_Media, does it work? If it does not, please open your browser’s dev tools and check for errors under the “Console” tab as well as for failing requests under the “Network” tab.
If it works from the interactive web I/F but fails from your own code, please provide the full code and I’ll take a look.
You may also be interested in https://github.com/kaltura/kaltura-parallel-upload-resumablejs.
You can see a fully functional demo for that [working against our SaaS endpoint - www.kaltura.com] here:
https://www.kaltura.org/demos/parallel-chunked-upload/index.html