diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 257aa4b85..81547d3bb 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -56,6 +56,7 @@ define('PATH_SMARTY_CACHE', PATH_TRUNK . 'shared/compiled/smarty/cache');
 define('PATH_THIRDPARTY', PATH_TRUNK . 'thirdparty/');
 define("URL_KEY", 'c0l0s40pt1mu59r1m3');
 define("PATH_XMLFORM", PATH_CORE . "xmlform" . PATH_SEP);
+define('PATH_DOCUMENT', PATH_WORKSPACE . '/files/');
 
 // Set Time Zone
 $_SESSION['__SYSTEM_UTC_TIME_ZONE__'] = (int) (env('MAIN_SYSTEM_UTC_TIME_ZONE', 'workflow')) == 1;
diff --git a/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php b/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
index dcea64514..55c762947 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
@@ -4,6 +4,7 @@ namespace ProcessMaker\BusinessModel;
 
 use Exception;
 use G;
+use ProcessMaker\BusinessModel\Cases;
 use ProcessMaker\Model\Application;
 use ProcessMaker\Model\Delegation;
 use ProcessMaker\Model\Documents;
@@ -29,8 +30,8 @@ class CasesTest extends TestCase
         Documents::truncate();
         Application::truncate();
         User::where('USR_ID', '=', 1)
-                ->where('USR_ID', '=', 2)
-                ->delete();
+            ->where('USR_ID', '=', 2)
+            ->delete();
     }
 
     /**
@@ -132,4 +133,104 @@ class CasesTest extends TestCase
         // Remove the path created
         G::rm_dir($pathCase);
     }
+
+    /**
+     * It tests the uploadFiles method
+     * 
+     * @covers \ProcessMaker\BusinessModel\Cases::uploadFiles()
+     * @test
+     */
+    public function it_should_test_upload_files_method()
+    {
+        $user = factory(User::class)->create();
+        $application = factory(Application::class)->create([
+            'APP_CUR_USER' => $user->USR_UID
+        ]);
+        $delegation = factory(Delegation::class)->create([
+            'APP_UID' => $application->APP_UID
+        ]);
+        $varName = "/tmp/test.pdf";
+        fopen($varName, "w");
+        $_FILES = ["form" =>
+        [
+            "name" => ["test"],
+            "type" => ["application/pdf"],
+            "tmp_name" => ["/tmp/test.pdf"],
+            "error" => [0],
+            "size" => [0]
+        ]];
+
+        $case = new Cases();
+
+        // Call the uploadFiles method, sending the delIndex
+        $res = $case->uploadFiles($user->USR_UID, $application->APP_UID, $varName, -1, null, $delegation->DEL_INDEX);
+        // Asserts the result is not empy
+        $this->assertNotEmpty($res);
+
+        //Call the uploadFiles method, without the delIndex
+        $res = $case->uploadFiles($user->USR_UID, $application->APP_UID, $varName);
+        // Asserts the result is not empy
+        $this->assertNotEmpty($res);
+    }
+
+    /**
+     * It tests the exception in the uploadFiles method
+     * 
+     * @covers \ProcessMaker\BusinessModel\Cases::uploadFiles()
+     * @test
+     */
+    public function it_should_test_exception_in_upload_files_method()
+    {
+        $user = factory(User::class)->create();
+        $application = factory(Application::class)->create([
+            'APP_CUR_USER' => $user->USR_UID
+        ]);
+        factory(Delegation::class)->create([
+            'APP_UID' => $application->APP_UID
+        ]);
+        $varName = "/tmp/test.pdf";
+        fopen($varName, "w");
+
+        $_FILES = [];
+        $case = new Cases();
+
+        // Asserts an exception is expected
+        $this->expectExceptionMessage("**ID_ERROR_UPLOAD_FILE_CONTACT_ADMINISTRATOR**");
+        // Call the uploadFiles method
+        $case->uploadFiles($user->USR_UID, $application->APP_UID, $varName);
+    }
+
+    /**
+     * It tests the exception in uploadFiles method
+     * 
+     * @covers \ProcessMaker\BusinessModel\Cases::uploadFiles()
+     * @test
+     */
+    public function it_should_test_the_exception_in_upload_files_method()
+    {
+        $user = factory(User::class)->create();
+        $application = factory(Application::class)->create([
+            'APP_CUR_USER' => $user->USR_UID
+        ]);
+        $delegation = factory(Delegation::class)->create([
+            'APP_UID' => $application->APP_UID
+        ]);
+        $varName = "/tmp/test.pdf";
+        fopen($varName, "w");
+        $_FILES = ["form" =>
+        [
+            "name" => ["test"],
+            "type" => ["application/pdf"],
+            "tmp_name" => ["/tmp/test.pdf"],
+            "error" => [UPLOAD_ERR_INI_SIZE],
+            "size" => [0]
+        ]];
+
+        $case = new Cases();
+
+        // Asserts there is an exception for the file
+        $this->expectExceptionMessage("The uploaded file exceeds the upload_max_filesize directive in php.ini");
+        // Call the uploadFiles method
+        $case->uploadFiles($user->USR_UID, $application->APP_UID, $varName, -1, null, $delegation->DEL_INDEX);
+    }
 }
diff --git a/tests/unit/workflow/engine/src/ProcessMaker/Services/Api/CasesTest.php b/tests/unit/workflow/engine/src/ProcessMaker/Services/Api/CasesTest.php
index a0afdbdb5..f20ac2124 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/Services/Api/CasesTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/Services/Api/CasesTest.php
@@ -7,6 +7,9 @@ use Luracast\Restler\Defaults;
 use Luracast\Restler\HumanReadableCache;
 use Luracast\Restler\RestException;
 use Maveriks\Extension\Restler;
+use ProcessMaker\Model\Application;
+use ProcessMaker\Model\Delegation;
+use ProcessMaker\Model\User;
 use ProcessMaker\Services\Api\Cases;
 use RBAC;
 use ReflectionClass;
@@ -213,4 +216,74 @@ class CasesTest extends TestCase
 
         $this->assertTrue($expected);
     }
+
+    /**
+     * Test the uploadDocumentToCase method
+     * 
+     * @covers ProcessMaker\Services\Api\Cases::uploadDocumentToCase
+     * @test
+     */
+    public function test_upload_document_to_case_method()
+    {
+        $user = factory(User::class)->create();
+        $application = factory(Application::class)->create([
+            'APP_CUR_USER' => $user->USR_UID
+        ]);
+        $delegation = factory(Delegation::class)->create([
+            'APP_UID' => $application->APP_UID
+        ]);
+        $varName = "/tmp/test.pdf";
+
+        $varName = "/tmp/test.pdf";
+        fopen($varName, "w");
+        $_FILES = ["form" =>
+        [
+            "name" => ["test"],
+            "type" => ["application/pdf"],
+            "tmp_name" => ["/tmp/test.pdf"],
+            "error" => [0],
+            "size" => [0]
+        ]];
+
+        $case = new Cases();
+
+        //Call the uploadDocumentToCase method without a post delindex
+        $res = $case->uploadDocumentToCase($application->APP_UID, $varName);
+        //Asserts the result is not empty
+        $this->assertNotEmpty($res);
+        $_POST['delIndex'] = $delegation->DEL_INDEX;
+        //Call the uploadDocumentToCase method with a post delindex
+        $res = $case->uploadDocumentToCase($application->APP_UID, $varName, -1, null, $delegation->DEL_INDEX);
+        //Asserts the result is not empty
+        $this->assertNotEmpty($res);
+    }
+
+    /**
+     * Test the exception in the uploadDocumentToCase method
+     * 
+     * @covers ProcessMaker\Services\Api\Cases::uploadDocumentToCase
+     * @test
+     */
+    public function test_exception_upload_document_to_case_method()
+    {
+        $user = factory(User::class)->create();
+        $application = factory(Application::class)->create([
+            'APP_CUR_USER' => $user->USR_UID
+        ]);
+        $delegation = factory(Delegation::class)->create([
+            'APP_UID' => $application->APP_UID
+        ]);
+        $varName = "/tmp/test.pdf";
+
+        $varName = "/tmp/test.pdf";
+        fopen($varName, "w");
+        $_FILES = [];
+
+        $case = new Cases();
+
+        //Asserts the expected exception
+        $this->expectExceptionMessage("**ID_ERROR_UPLOAD_FILE_CONTACT_ADMINISTRATOR**");
+        //Call the uploadDocumentToCase method without a post delindex
+        $res = $case->uploadDocumentToCase($application->APP_UID, $varName);
+    }
 }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php b/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
index b021baa02..8eb634c41 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
@@ -3783,17 +3783,22 @@ class Cases
      * @param string $varName
      * @param mixed $inpDocUid
      * @param string $appDocUid
+     * @param int $delegationIndex
      *
      * @return array
      * @throws Exception
      */
-    public function uploadFiles($userUid, $appUid, $varName, $inpDocUid = -1, $appDocUid = null)
+    public function uploadFiles($userUid, $appUid, $varName, $inpDocUid = -1, $appDocUid = null, $delegationIndex = null)
     {
         $response = [];
         if (isset($_FILES["form"]["name"]) && count($_FILES["form"]["name"]) > 0) {
             // Get the delIndex related to the case
             $cases = new ClassesCases();
-            $delIndex = $cases->getCurrentDelegation($appUid, $userUid);
+            if (!empty($delegationIndex)) {
+                $delIndex = $delegationIndex;
+            } else {
+                $delIndex = $cases->getCurrentDelegation($appUid, $userUid);
+            }
             // Get information about the user
             $user = new ModelUsers();
             $userCreator = $user->loadDetailed($userUid)['USR_FULLNAME'];
diff --git a/workflow/engine/src/ProcessMaker/Services/Api/Cases.php b/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
index e6e433505..af67f6785 100644
--- a/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
+++ b/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
@@ -1409,6 +1409,7 @@ class Cases extends Api
      * @param string $var_name
      * @param string $doc_uid
      * @param string $app_doc_uid
+     * @param int $delIndex {@from body}
      *
      * @return array
      * @throws RestException
@@ -1416,12 +1417,16 @@ class Cases extends Api
      * @access protected
      * @class AccessControl {@permission PM_CASES}
      */
-    public function uploadDocumentToCase($app_uid, $var_name, $doc_uid = '-1', $app_doc_uid = null)
+    public function uploadDocumentToCase($app_uid, $var_name, $doc_uid = '-1', $app_doc_uid = null, $delIndex = null)
     {
         try {
             $userUid = $this->getUserId();
             $case = new BmCases();
-            $response = $case->uploadFiles($userUid, $app_uid, $var_name, $doc_uid, $app_doc_uid);
+            if (isset($delIndex)) {
+                $response = $case->uploadFiles($userUid, $app_uid, $var_name, $doc_uid, $app_doc_uid, $delIndex);
+            } else {
+                $response = $case->uploadFiles($userUid, $app_uid, $var_name, $doc_uid, $app_doc_uid);
+            }
         } catch (ExceptionRestApi $e) {
             throw new RestException($e->getCode(), $e->getMessage());
         } catch (Exception $e) {