diff --git a/src/api/controls/JobControl.test.ts b/src/api/controls/JobControl.test.ts
index f15844f..0398eef 100644
--- a/src/api/controls/JobControl.test.ts
+++ b/src/api/controls/JobControl.test.ts
@@ -1,4 +1,5 @@
 import axios from 'axios';
+import * as fs from 'fs';
 import { JobControl } from './JobControl';
 import { FiveMClient } from '../../FiveMClient';
 import { Control } from './Control';
@@ -6,7 +7,9 @@ import { Endpoints } from '../server/Endpoints';
 import { AD5XMaterialMapping } from '../../models/ff-models';
 
 jest.mock('axios');
+jest.mock('fs');
 const mockedAxios = axios as jest.Mocked<typeof axios>;
+const mockedFs = fs as jest.Mocked<typeof fs>;
 
 jest.mock('./Control');
 
@@ -106,6 +109,47 @@ describe('JobControl', () => {
     });
   });
 
+  describe('uploadFile', () => {
+    const testFilePath = '/path/to/test.gcode';
+    const testFileSize = 1024;
+
+    beforeEach(() => {
+      // @ts-ignore
+      mockedFs.promises = {
+        access: jest.fn().mockResolvedValue(undefined),
+        stat: jest.fn().mockResolvedValue({ size: testFileSize } as fs.Stats)
+      } as any;
+      // @ts-ignore
+      fs.promises = mockedFs.promises;
+      mockedFs.createReadStream.mockReturnValue('dummy-stream' as any);
+    });
+
+    it('should return false if file does not exist', async () => {
+      // @ts-ignore
+      mockedFs.promises.access.mockRejectedValue(new Error('File not found'));
+
+      const result = await jobControl.uploadFile(testFilePath, false, false);
+
+      expect(result).toBe(false);
+      expect(mockedFs.promises.access).toHaveBeenCalledWith(testFilePath);
+    });
+
+    it('should upload file successfully', async () => {
+      mockedAxios.post.mockResolvedValue({
+        status: 200,
+        data: { code: 0, message: 'Success' }
+      });
+
+      const result = await jobControl.uploadFile(testFilePath, false, false);
+
+      expect(result).toBe(true);
+      expect(mockedFs.promises.access).toHaveBeenCalledWith(testFilePath);
+      expect(mockedFs.promises.stat).toHaveBeenCalledWith(testFilePath);
+      expect(mockedFs.createReadStream).toHaveBeenCalledWith(testFilePath);
+      expect(mockedAxios.post).toHaveBeenCalled();
+    });
+  });
+
   describe('printLocalFile', () => {
     it('should print local file with new firmware version', async () => {
       mockFiveMClient.firmVer = '3.1.3';
diff --git a/src/api/controls/JobControl.ts b/src/api/controls/JobControl.ts
index c2aa86d..8e75a9c 100644
--- a/src/api/controls/JobControl.ts
+++ b/src/api/controls/JobControl.ts
@@ -99,12 +99,14 @@ export class JobControl {
      * @returns A Promise that resolves to true if the file upload (and optional print start) is successful, false otherwise.
      */
     public async uploadFile(filePath: string, startPrint: boolean, levelBeforePrint: boolean): Promise<boolean> {
-        if (!fs.existsSync(filePath)) {
+        try {
+            await fs.promises.access(filePath);
+        } catch {
             console.error(`UploadFile error: File not found at ${filePath}`);
             return false;
         }
 
-        const stats = fs.statSync(filePath);
+        const stats = await fs.promises.stat(filePath);
         const fileSize = stats.size;
         const fileName = path.basename(filePath);
 
@@ -217,12 +219,14 @@ export class JobControl {
         }
 
         // Validate file exists
-        if (!fs.existsSync(params.filePath)) {
+        try {
+            await fs.promises.access(params.filePath);
+        } catch {
             console.error(`UploadFileAD5X error: File not found at ${params.filePath}`);
             return false;
         }
 
-        const stats = fs.statSync(params.filePath);
+        const stats = await fs.promises.stat(params.filePath);
         const fileSize = stats.size;
         const fileName = path.basename(params.filePath);