Adding new object to mongoDB changes the previously added object

I’m using AWS S3 and MongoDB in a full-stack react application.

When I add a new recept in front-end it works normally. But once in a while it changes the rndImageName which I create on back-end. Images uploads to S3 fine.

Is there better way to do this?

multer.js

const randomImageName = (bytes = 32) => crypto.randomBytes(bytes).toString('hex')
let rndImageName = randomImageName();

awsRouter.post('/recipeImages', upload.single('file'), async (req, res) => {

  const buffer = await sharp(req.file.buffer).resize({ height: 1920, width: 1080, fit: 'contain' }).toBuffer()

  const params = {
    Bucket: bucketName,
    Key: 'recipeImages/' + rndImageName, 
    Body: buffer,
    ContentType: req.file.mimetype
  }

  const command = new PutObjectCommand(params)

  await s3.send(command)

})


recipes.js 

const { rndImageName } = require('./multer')

recipesRouter.post('/', async (request, response, next) => {

  const body = request.body

  const decodedToken = jwt.verify(getTokenFrom(request), process.env.SECRET)

  if (!decodedToken.id) {
    return response.status(401).json({ error: 'token invalid' })
  }
  const user = await User.findById(decodedToken.id)


  const recipe = new Recipe({
    id: body.id,
    recipe_name: body.recipe_name,
    ingredients: body.ingredients,
    instructions: body.instructions,
    speed: body.speed,
    category: body.category,
    main_ingredient: body.main_ingredient,
    diet: body.diet,
    likes: body.likes || 0,
    comments: body.comments || [],
    created: new Date(),
    imageName: rndImageName,
    user: user._id
  })

  const savedRecipe = await recipe.save()
  user.recipes = user.recipes.concat(savedRecipe._id)
  await user.save()

})

I want to insert the rndImageName (which I set up for S3 file name) to mongoDB objects so I can create signedUrl for a specific recipe.

Now it seems to use the same randomImageName again. Also changing the previously added recipe’s imageName.