diff --git a/src/useCases/PreLoadUseCase.ts b/src/useCases/PreLoadUseCase.ts
index 5f2b23ea..c6c5549f 100644
--- a/src/useCases/PreLoadUseCase.ts
+++ b/src/useCases/PreLoadUseCase.ts
@@ -17,10 +17,11 @@ export const PreLoadUseCase =
   (apiKey: ApiKey) =>
   (body: PreLoadRequestBody): TE.TaskEither<Error, PreLoadRecord['output']> => {
     const input = { apiKey, body };
-    const url = uploadToS3URL.href;
+    const baseURL = uploadToS3URL.href;
     const returned = body.map((req) => {
       // TODO: Move into an adapter
       const [key, secret] = [crypto.randomUUID(), crypto.randomUUID()];
+      const url = `${baseURL}/${key}`;
       return makePreLoadResponse(key, secret, url, req);
     });
     const output = onValidApiKey(apiKey)({ statusCode: 200 as const, returned });
diff --git a/src/useCases/__tests__/PreLoadUseCase.test.ts b/src/useCases/__tests__/PreLoadUseCase.test.ts
new file mode 100644
index 00000000..4604636e
--- /dev/null
+++ b/src/useCases/__tests__/PreLoadUseCase.test.ts
@@ -0,0 +1,37 @@
+import * as E from 'fp-ts/Either';
+import * as RA from 'fp-ts/ReadonlyArray';
+import { makeLogger } from '../../logger';
+import { PreLoadUseCase } from '../PreLoadUseCase';
+import { config } from '../../__tests__/data';
+import * as inMemory from '../../adapters/inMemory';
+import { pipe } from 'fp-ts/lib/function';
+
+// TODO: Remove this hardcoded value; the valid api-key at some point will be taken from envs
+const apiKey = 'key-value';
+const logger = makeLogger();
+const repository = inMemory.makeRepository(logger)([]);
+const body = [
+  {
+    preloadIdx: '0',
+    contentType: 'application/pdf',
+    sha256: 'sha-value',
+  },
+];
+
+describe('PreLoadUseCase', () => {
+  it('should return the key into url for each elements', async () => {
+    const actual = await PreLoadUseCase(logger, config.server.uploadToS3URL, repository)(apiKey)(body)();
+    const checkKey = pipe(
+      actual,
+      E.exists(
+        (element) =>
+          element.statusCode === 200 &&
+          pipe(
+            element.returned,
+            RA.every((_) => _.url.endsWith(_.key))
+          )
+      )
+    );
+    expect(checkKey).toBeTruthy();
+  });
+});