In both Windows 10 and Windows 11, the Internet Cache or Temporary Internet Files are stored in the directory. However, the exact path might differ slightly depending on the version and configuration of your system.
What is the version of Outlook you are using?
If you're using the classic version, try the following settings:
Please open PowerPoint and select File >Option > Trust Center > Trust Center Settings > Protected View > Uncheck 'Enable Protected View for Outlook Attachments' option> OK > OK. to check there is any improvement.
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.