Rasa X model training & uploading fails

I have never been able to train a model within the Rasa X UI successfully, and have not been able to troubleshoot by looking at similar posts on the forum. It just gets stuck at this screen forever:

I used to be able to upload a model from my local computer to the Rasa X server, but now I can’t. I didn’t upgrade or change anything that would cause this, to my knowledge. I checked the docker logs but there were no errors. The weird thing is that it only takes 5-10 seconds for the upload to fail:

I don’t know how to continue using Rasa X when I can’t get a working model uploaded or trained.

Here are my python, docker, docker-compose, and rasa versions: