diff --git a/api/app/Service/Forms/FormSubmissionFormatter.php b/api/app/Service/Forms/FormSubmissionFormatter.php
index 5b123c85..95f4356b 100644
--- a/api/app/Service/Forms/FormSubmissionFormatter.php
+++ b/api/app/Service/Forms/FormSubmissionFormatter.php
@@ -158,7 +158,7 @@ class FormSubmissionFormatter
                 }
             } elseif ($field['type'] == 'matrix' && is_array($data[$field['id']])) {
                 $returnArray[$field['name']] = $this->getMatrixString($data[$field['id']]);
-            } elseif ($field['type'] == 'files') {
+            } elseif (in_array($field['type'], ['files', 'signature'])) {
                 if ($this->outputStringsOnly) {
                     $formId = $this->form->id;
                     $returnArray[$field['name']] = implode(
@@ -234,7 +234,7 @@ class FormSubmissionFormatter
                 }
             } elseif ($field['type'] == 'matrix') {
                 $field['value'] = str_replace(' | ', "\n", $this->getMatrixString($data[$field['id']]));
-            } elseif ($field['type'] == 'files') {
+            } elseif (in_array($field['type'], ['files', 'signature'])) {
                 if ($this->outputStringsOnly) {
                     $formId = $this->form->id;
                     $field['value'] = implode(