Hi @vsx-sieber
Welcome to Speckle’s community, and sorry that you’re first experience with running the server wasn’t as smooth as we’d like. If you haven’t already, please do introduce yourself in our introductions discussion if you wish - we’d love to know more about what you hope to achieve with Speckle.
It appears that perhaps it is the websocket connection that is broken, this is causing the 404 error message. As a result perhaps the file is not actually being uploaded, so the code that stores the file in S3 is never run.
Are there any relevant logs in the speckle-server container that is running in docker? (you can also retrieve them from the Docker desktop dashboard if you are using that instead of the command line).
Are you also receiving websocket errors when you attempt to add comments to a model? We had a similar error reported earlier this month related to this, which was solved by changes to the ingress.
Iain