The re-upload feature is planned but it involves a few design decisions that are not trivial. Going back to your analogy with a word document, I’m sure you would like to have the option to undo changes if you made them, therefore old versions of the model shouldn’t be deleted but rather a model versioning should be implemented. We have a pretty good idea of what the feature will look like and will make sure it gets implemented in the near future, since other users are feeling the frustration as well.