Photos not showing in the report

[Charlie1]

I have created an app, that will export a list of defective items with photos included, with use of Workflow Rule > Task > Create a new file. However, the report generated did not show part of the photos (e.g. item O19) but the blue text and broken image icon instead.

If I click on the text, it will open a new tab and redirect to the exact image; so I do not think the image is corrupted. I tried again and the part of the images did show up, but not all of them.

Can someone please advise me what is going wrong and how do I fix it