Hi GentleSwallow91 ,
I can't manage to reproduce the issue, it is working fine for me. I use a local minio docker-based image. The conf file has to be precisely configured, but it seems that you did it ok, because you don't have a denied access here. It is strange that he is waiting for the upload to finish. We have this flag for upload_artefact : wait_on_upload . His default value should be False, but i would try to add it...

Also I don't understand what you mean by " I can see files in ClearML GUI in metadata but not in minio". Do you have the previews ? Then you could check where they are stored via the developer tool.