Expert Needed: Fix Broken Thumbnails in Existing Web Application File List

We require a skilled developer to diagnose and resolve an issue with broken thumbnails in the file list section of our existing web application. The current display shows placeholder or broken image icons instead of the actual file previews. The freelancer will need to investigate the root cause, which may involve checking image paths, server configurations, database entries, or front-end rendering logic. The primary goal is to restore the correct display of all file thumbnails, ensuring a seamless user experience for our users. Please describe your experience with similar debugging tasks and relevant web technologies in your proposal.