Unable to "Upload model zip" to Cloud Annotations to autolabel my dataset

Question

I labeled 21 images for classification (only one tag) and I'm aware of the small size of my training data, I'm just testing. Then I used the button "Train in Colab", I trained the model and saved the .zip file. (I did not modify the code at all, I only changed the credentials to match my bucket.

Then I went back to Cloud Annotations and tried to upload my model to do Autolabeling by clicking File>Upload model zip. But after selecting my zip file the web app hangs in Saving... (Photo of the message after clicking Upload model zip). The button "No model available" stays.

I have literally waited for hours and nothing changes, the browser console gives no error message. I have tried with firefox, chrome, and edge having the same issue. I also have done the complete process more than three times and still no luck.

Anyone having the same issue? Or any way to fix it?

Thank you in advance!