Hi,
I had the same problem at Chrome, Mircosoft Edge, Internet Explore.
I send the developer tool erri in my browser Mircosoft Edge
Here is a link to similar question that relates to attachments not loading in the new issue view. Atlassian has captured a few known bugs that you can see if they match your experience
https://community.atlassian.com/t5/Jira-questions/How-to-fix-quot-failed-to-load-quot-error-at-attachments-in-Jira/qaq-p/952044
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