Hi Palanivelrajan P
There are 3 methods which you can achieve this
Method1: Construct the file url from the app web and pass the file url via
window.ReactNativeWebView.postMessage(imageUrl); then use native-fs to download the file directly but remember the Session_Auth should be avaible.
Method2: Convert the file into base64 and pass it to native via window.ReactNativeWebView.postMessage(imageUrl); then reconstruct the file in mobile[ preferred if the file size is less]
Method3: Get the file ID from web view and download it via a exposed API
I hope this helps!!