Local Machine changes are not reflecting in container app response with docker volume command

I am trying to map docker container’s folders to local machine folders using docker volume. I created an image and ran container. When the container started running, I made some changes in the local machine files, but my changes are not reflecting in the container’s running application response.

Dockerfile.dev

#Specifying base image

FROM node:alpine

#Set Working directory

WORKDIR = "/webapp/"

#Copy the package json file
COPY ./package.json .

# Download the dependencies

RUN npm install

#Copy the remaining files

COPY ./ ./

#Start up command

CMD ["npm","run","start"]

Creating an image = docker build -f Dockerfile.dev .

Creating and running application in the container = docker run -p 3000:3000 -v folder_of_app:/webapp Image

Source: StackOverflow