Merge branch 'feature/REQ-5965' into test

workflow-engine-core/src/main/java/cn/axzo/workflow/core/service/impl/BpmnProcessInstanceServiceImpl.java

@@ -1910,6 +1910,9 @@ public class BpmnProcessInstanceServiceImpl implements BpmnProcessInstanceServic
             if (Objects.nonNull(archive)) {
                 t.setFileRelationId(archive.getFileCode());
                 t.setFileKey(archive.getFileKey());
+            } else {
+                // 业务自定义文档
+                t.setFileKey(s.getFileRelationId());
             }
             t.setReadStatus(readStatusMap.getOrDefault(t.getId(), false));
         });