Share dataset to users ( content pack )

Hi,

i have a workspace "POWERBI" with 1 dataset  and 4 reports.

The dataset is located in the POWERBI sharepoint documents. Once a week i update it.

Only the administrator (me) can view and edit the dataset. User don't see dataset tab. 

Up to here everything is ok.

I want to share the dataset (automatically refreshed whith the original dataset) to some users ( these users are also in the POWERBI Office 365 group) for let them work on it.

I created a content pack that only contain the dataset and i shared this to the users.

For 2 days it works ( they make a copy of the dataset and use it in their personal workspace area).

Nowdays the dataset icon in the personal area (when it worked the icon was a db, now the icon is a db with a little chain in the corner) has changed and you can not copy anymore. So you can't work on it.

I've tried to re-share the content pack but now if i only put the dataset users cant download it. User go to organizational content pack, click on it but nothing show. If i put also a report in the content pack they can download it but they can't work on the dataset (make a copy).

What happened in those 2 days?

My goal is : share dataset with some user and allow them to work on it without modify the original. Stop, nothing else.

If I understood correctly the only way to do this is use content pack.

Help me pls,thanks