Unfortunately, there is no option to download snapshots from the Work Diary in bulk. Your can view a snapshot and save it by right-clicking on it and saving an image. Also, you always have access to the Work Diary via your Upwork account.
If the consultant has Upwork account, you can add them as a team member and give them access to Work Diary. In order to do that, you need to go to Settings> Members & Permissions and click "Invite a New User."
Here is more information about adding team members and setting up permissions.
Dear Upwork Administrators,
I believe it is a must have feature to have the ability to download hired freelancers screenshots and view them offline and/or store them for future reference.
Kindly do something about this and please update your response to **Edited for community guidelines**
**Edited for community guidelines**