Hi @LD,
I'm afraid there is no way to open the shared link from Outlook app in SharePoint mobile app. It's currently not supported in the mobile apps.
But if you have OneDrive mobile app and you have OneDrive access, when you click the Open button in the sharing mail you will be redirected the OneDrive mobile app and open the folder in your personal OneDrive.
Thanks.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.