Error Message for /export/file endpoint if requested file not found is missleading

[joschrew]

It is hardly distinguishable if the endpoint is not found or if the endpoint cannot find the requested file. Error message must contain something like: "requested path xxx for id yyy not found".
Error message for wrong endpoint requested:
{"timestamp":"2022-08-18T15:02:13.084+00:00","status":404,"error":"Not Found","message":"","path":"/export/non-existing-endpoint"}

Error message for correctly queried enpoint but not existing file:
{"httpCode":404,"httpStatus":"NOT_FOUND","message":"File not found.","timestamp":"2022-08-18T15:03:02.960959Z","path":"/export/file"}