
Hi @Joe Zhu,
Unfortunately, it is not implemented in the Chromium engine that TIFF images can be viewed. A possible way for you is to use IE mode for viewing TIFF images.
If you would like to stick to regular Edge mode instead, we recommend you converting to formats that are supported by Microsoft Edge or take the advantage of Edge extensions to help you display TIFF images. Thanks for your understanding.
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.
Best Regards,
Shijie Li