diff --git a/packages/builder/src/components/start/ImportAppModal.svelte b/packages/builder/src/components/start/ImportAppModal.svelte
index 329c8286ca..7496b5824d 100644
--- a/packages/builder/src/components/start/ImportAppModal.svelte
+++ b/packages/builder/src/components/start/ImportAppModal.svelte
@@ -1,5 +1,7 @@
 <script>
-  import { ModalContent, Toggle, Input, Layout, Dropzone } from "@budibase/bbui"
+  import { ModalContent, Toggle, Input, Layout, Dropzone, notifications } from "@budibase/bbui"
+  import { API } from "api"
+  import { automationStore, store } from "../../builderStore"
 
   export let app
 
@@ -8,8 +10,22 @@
     password
   let file
 
-  function updateApp() {
-    console.log("confirm")
+  async function updateApp() {
+    try {
+      let data = new FormData()
+      data.append("appExport", file)
+      if (encrypted) {
+        data.append("encryptionPassword", password.trim())
+      }
+      const appId = app.devId
+      await API.updateAppFromExport(appId, data)
+      const pkg = await API.fetchAppPackage(appId)
+      await store.actions.initialise(pkg)
+      await automationStore.actions.fetch()
+      notifications.success("App updated successfully")
+    } catch (err) {
+      notifications.error(`Failed to update app - ${err.message || err}`)
+    }
   }
 </script>
 
diff --git a/packages/frontend-core/src/api/app.js b/packages/frontend-core/src/api/app.js
index 982066f05a..49137cbecd 100644
--- a/packages/frontend-core/src/api/app.js
+++ b/packages/frontend-core/src/api/app.js
@@ -1,3 +1,5 @@
+import { sdk } from "@budibase/shared-core"
+
 export const buildAppEndpoints = API => ({
   /**
    * Fetches screen definition for an app.
@@ -81,6 +83,22 @@ export const buildAppEndpoints = API => ({
     })
   },
 
+  /**
+   * Update an application using an export - the body
+   * should be of type FormData, with a "file" and a "password" if encrypted.
+   * @param appId The ID of the app to update - this will always be
+   * converted to development ID.
+   * @param body a FormData body with a file and password.
+   */
+  updateAppFromExport: async (appId, body) => {
+    const devId = sdk.applications.getDevAppID(appId)
+    return await API.post({
+      url: `/api/applications/${devId}/import`,
+      body,
+      json: false,
+    })
+  },
+
   /**
    * Imports an export of all apps.
    * @param apps the FormData containing the apps to import
diff --git a/packages/server/src/api/controllers/application.ts b/packages/server/src/api/controllers/application.ts
index ad6780e61b..a7d3634a89 100644
--- a/packages/server/src/api/controllers/application.ts
+++ b/packages/server/src/api/controllers/application.ts
@@ -575,7 +575,16 @@ export async function sync(ctx: UserCtx) {
   }
 }
 
-export async function updateWithExport(ctx: UserCtx) {}
+export async function importToApp(ctx: UserCtx) {
+  const { appId } = ctx.params
+  const appExport = ctx.request.files?.appExport
+  const password = ctx.request.body.encryptionPassword
+  if (!appExport) {
+    ctx.throw(400, "Must supply app export to import")
+  }
+  console.log(appExport)
+  ctx.body = { message: "app updated" }
+}
 
 export async function updateAppPackage(appPackage: any, appId: any) {
   return context.doInAppContext(appId, async () => {
diff --git a/packages/server/src/api/routes/application.ts b/packages/server/src/api/routes/application.ts
index aef32ee559..a21d6a2153 100644
--- a/packages/server/src/api/routes/application.ts
+++ b/packages/server/src/api/routes/application.ts
@@ -4,6 +4,7 @@ import * as deploymentController from "../controllers/deploy"
 import authorized from "../../middleware/authorized"
 import { permissions } from "@budibase/backend-core"
 import { applicationValidator } from "./utils/validators"
+import { importToApp } from "../controllers/application"
 
 const router: Router = new Router()
 
@@ -59,9 +60,9 @@ router
     controller.destroy
   )
   .post(
-    "/api/applications/:appId/update",
+    "/api/applications/:appId/import",
     authorized(permissions.BUILDER),
-    controller.updateWithExport
+    controller.importToApp
   )
 
 export default router