Sorry for being late to the party WearyLeopard29 , if you want to see get_mutable_copy() in the wild you can check the last cell of this notebook:

https://github.com/abiller/events/blob/webinars/videos/the_clear_show/S02/E05/dataset_edit_00.ipynb

Or skip to 3:30 in this video:

https://youtube.com/watch?v=NhSRW12Bn5w&feature=share

You can get a mutable copy of the entire dataset (original version), with get_mutable_copy() Then change the files on the returned directory, then create a new Dataset with the parent dataset as the original verison, then sync the folder.
You can also just update the specific file (without needing to download the entire original version)

Hi WearyLeopard29
Yes 🙂 this is exactly how it should work

Make sense ?

What is the specific use case, updating a file on existing dataset and creating a new version?

Yes thanks I'll try it