
Dear @Chris Wallace,
Thank you so much for contacting Microsoft Q&A Forum.
Based on your detailed descriptions, you are experiencing with OneDrive's Personal Vault on Safari for MacBook where non-Microsoft file types like .pdf, .jpg, .txt, .png, .mp4, etc., fail to display, is a known rendering issue affecting Safari, particularly versions 18.0 and 18.1 on macOS Sequoia. Although there is currently no official acknowledgment or documentation from Microsoft regarding this problem, several users have reported similar experiences. These cases may offer useful insights or potential workarounds, and I recommend reviewing them for further guidance:
- This user may solve the problem: One drive via Safari Web Browser not working - Microsoft Community
- You can also take a look in here including all comments: onedrive ios does not show Personal Vault - Microsoft Community
I hope this information can help you to solve your issue soon so that your work can be back on track.
Wish you a pleasant day!
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