Firebase Functions: Upload Error: HTTP Error: 400, Unknown Error

I tried to deploy the server side of my Angular Universal SSR app to Firebase Functions, but ran into the error Upload Error: HTTP Error: 400, Unknown Error.

From what I understand, this error happens pretty often when the deployment is a huge file (in my case it's 438mb). The reason it's so big is because I'm deploying localized versions of my website so dist/browser and dist/server both have en, de, and fr directories with pretty much the same content. How can I solve this issue?

console output

=== Deploying to 'PROJECT_NAME'...

i  deploying functions
Running command: npm --prefix "$RESOURCE_DIR" run lint
+  functions: Finished running predeploy script.
i  functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i  functions: ensuring required API cloudbuild.googleapis.com is enabled...
+  functions: required API cloudfunctions.googleapis.com is enabled
i  functions: preparing dist directory for uploading...
i  functions: packaged dist (438.04 MB) for uploading
!  functions: Upload Error: HTTP Error: 400, Unknown Error

Error: HTTP Error: 400, Unknown Error

index.js

const functions = require('firebase-functions');

// Increase readability in Cloud Logging
require("firebase-functions/lib/logger/compat");

const expressApp = require('./server/proxy').app();

exports.ssr = functions
  .region('us-central1')
  .runWith({})
  .https
  .onRequest(expressApp);

proxy.ts (which gets compiled to js and put into the dist/server folder)

import * as express from 'express';
import * as cookieParser from 'cookie-parser';
import { join } from 'path';

export function app() {
  const server = express();

  server.use(cookieParser());

  const languages = ['en', 'de', 'fr'];

  languages.forEach((locale) => {
    const appServerModule = require(join(__dirname, locale, 'main.js'));
    server.use(`/${locale}`, appServerModule.app(locale));
  });

  server.get('/(:locale(en|fr|de)/)?*', (req, res, next) => {
    const { locale } = req.params;
    let userLocale = (req.headers['accept-language'] || '').substring(0, 2);

    if(!languages.includes(userLocale)) {
      userLocale = 'en';
    }

    if (locale !== userLocale) {
      res.redirect(userLocale + req.url);
    }
  });

  return server;
}

function run() {
  app().listen(4200, () => {
    console.log(`Node Express server listening on http://localhost:4200`);
  });
}

run();