View only Mode:
When sharing a file, the recipient will automatically receive the file in view only mode. All this means is they can look at all of the data, but can not alter it in any way. They can not apply functions, or transform the data, but they can group it.
If you receive a file, and wish to make changes to it, or add it to your datasets, simply click the “view only” button in the top right corner, and select “save a copy”. This will then create a copy of the file in your datasets. You can then open the copy, and transform it however you like.