How to fix broken Laravel link to local file system?

We inherited a custom laravel app and in the admin area, a link that points to a file in the local storage has broken:

This site can’t be reached
The webpage at https://domain.tld/admin/donor/1818/document/56/DCCA8ACC-7B1B-4D90-977C-257BDA5AE56E.png might be temporarily down or it may have moved permanently to a new web address.
ERR_INVALID_RESPONSE

These links used to work, so I'm not sure what broke. I've verified that the all folders and files in the app have correct permissions and ownership.

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