Hi WearyLeopard29
Yes 🙂 this is exactly how it should work

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

Make sense ?

Yes thanks I'll try it

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)