diff --git a/generators/typescript/sdk/CHANGELOG.md b/generators/typescript/sdk/CHANGELOG.md
index 0ffec774d58..497c462e5b5 100644
--- a/generators/typescript/sdk/CHANGELOG.md
+++ b/generators/typescript/sdk/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.40.8] - 2024-09-28
+
+- Fix: File array uploads now call `request.appendFile` instead of `request.append` which 
+  was causing form data to be in a corrupted state. 
+
 ## [0.40.7] - 2024-09-28
 
 - Fix: The generated README will now have a section that links to the generated
diff --git a/generators/typescript/sdk/VERSION b/generators/typescript/sdk/VERSION
index 7754b3ee7fd..e374d018191 100644
--- a/generators/typescript/sdk/VERSION
+++ b/generators/typescript/sdk/VERSION
@@ -1 +1 @@
-0.40.7
+0.40.8
diff --git a/generators/typescript/sdk/client-class-generator/src/endpoints/utils/appendPropertyToFormData.ts b/generators/typescript/sdk/client-class-generator/src/endpoints/utils/appendPropertyToFormData.ts
index 2a62757e1a9..38cfe41fcdf 100644
--- a/generators/typescript/sdk/client-class-generator/src/endpoints/utils/appendPropertyToFormData.ts
+++ b/generators/typescript/sdk/client-class-generator/src/endpoints/utils/appendPropertyToFormData.ts
@@ -60,7 +60,7 @@ export function appendPropertyToFormData({
                     ),
                     ts.factory.createBlock(
                         [
-                            context.coreUtilities.formDataUtils.append({
+                            context.coreUtilities.formDataUtils.appendFile({
                                 referencetoFormData: referenceToFormData,
                                 key: property.key.wireValue,
                                 value: ts.factory.createIdentifier(FOR_LOOP_ITEM_VARIABLE_NAME)
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index bdd7acdfd50..fdae32e9512 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3333,6 +3333,8 @@ importers:
 
   packages/cli/cli/dist/dev: {}
 
+  packages/cli/cli/dist/prod: {}
+
   packages/cli/configuration:
     dependencies:
       '@fern-api/core-utils':
diff --git a/seed/ts-sdk/file-upload/no-custom-config/src/api/resources/service/client/Client.ts b/seed/ts-sdk/file-upload/no-custom-config/src/api/resources/service/client/Client.ts
index c93359af6d0..7ccfbf75359 100644
--- a/seed/ts-sdk/file-upload/no-custom-config/src/api/resources/service/client/Client.ts
+++ b/seed/ts-sdk/file-upload/no-custom-config/src/api/resources/service/client/Client.ts
@@ -54,7 +54,7 @@ export class Service {
         await _request.append("integer", request.integer.toString());
         await _request.appendFile("file", file);
         for (const _file of fileList) {
-            await _request.append("fileList", _file);
+            await _request.appendFile("fileList", _file);
         }
 
         if (maybeFile != null) {
@@ -63,7 +63,7 @@ export class Service {
 
         if (maybeFileList != null) {
             for (const _file of maybeFileList) {
-                await _request.append("maybeFileList", _file);
+                await _request.appendFile("maybeFileList", _file);
             }
         }
 
diff --git a/seed/ts-sdk/file-upload/wrap-file-properties/src/api/resources/service/client/Client.ts b/seed/ts-sdk/file-upload/wrap-file-properties/src/api/resources/service/client/Client.ts
index fdcf7355512..ba5d0251d5b 100644
--- a/seed/ts-sdk/file-upload/wrap-file-properties/src/api/resources/service/client/Client.ts
+++ b/seed/ts-sdk/file-upload/wrap-file-properties/src/api/resources/service/client/Client.ts
@@ -45,7 +45,7 @@ export class Service {
         await _request.append("integer", request.integer.toString());
         await _request.appendFile("file", request.file);
         for (const _file of request.fileList) {
-            await _request.append("fileList", _file);
+            await _request.appendFile("fileList", _file);
         }
 
         if (request.maybeFile != null) {
@@ -54,7 +54,7 @@ export class Service {
 
         if (request.maybeFileList != null) {
             for (const _file of request.maybeFileList) {
-                await _request.append("maybeFileList", _file);
+                await _request.appendFile("maybeFileList", _file);
             }
         }