diff --git a/.github/workflows/companion-deploy.yml b/.github/workflows/companion-deploy.yml
index c2d676def8..a8c06b6d5b 100644
--- a/.github/workflows/companion-deploy.yml
+++ b/.github/workflows/companion-deploy.yml
@@ -65,3 +65,20 @@ jobs:
           file: Dockerfile
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}
+
+  heroku:
+    name: Heroku
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+      - name: Alter dockerfile
+        run: |
+          sed -i 's/^EXPOSE 3020$/EXPOSE $PORT/g' Dockerfile
+      - name: Deploy to heroku
+        uses: akhileshns/heroku-deploy@v3.12.12
+        with:
+          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
+          heroku_app_name: companion-demo
+          heroku_email: ${{secrets.HEROKU_EMAIL}}
+          usedocker: true
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index edfa74e560..3f3d25d963 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -142,22 +142,3 @@ jobs:
           file: Dockerfile
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}
-
-  heroku:
-    name: Heroku
-    needs: release
-    if: ${{ needs.release.outputs.companionWasReleased }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v3
-      - name: Alter dockerfile
-        run: |
-          sed -i 's/^EXPOSE 3020$/EXPOSE $PORT/g' Dockerfile
-      - name: Deploy to heroku
-        uses: akhileshns/heroku-deploy@v3.12.12
-        with:
-          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
-          heroku_app_name: companion-demo
-          heroku_email: ${{secrets.HEROKU_EMAIL}}
-          usedocker: true
diff --git a/packages/@uppy/aws-s3-multipart/src/index.js b/packages/@uppy/aws-s3-multipart/src/index.js
index eac3c0b0c8..733857765c 100644
--- a/packages/@uppy/aws-s3-multipart/src/index.js
+++ b/packages/@uppy/aws-s3-multipart/src/index.js
@@ -623,7 +623,7 @@ export default class AwsS3Multipart extends BasePlugin {
 
       const token = file.serverToken
       const host = getSocketHost(file.remote.companionUrl)
-      const socket = new Socket({ target: `${host}/api/${token}` })
+      const socket = new Socket({ target: `${host}/api/${token}`, autoOpen: false })
       this.uploaderSockets[file.id] = socket
       this.uploaderEvents[file.id] = new EventTracker(this.uppy)
 
@@ -644,8 +644,9 @@ export default class AwsS3Multipart extends BasePlugin {
           // resume a queued upload to make it skip the queue.
           queuedRequest.abort()
           queuedRequest = this.requests.run(() => {
+            socket.open()
             socket.send('resume', {})
-            return () => {}
+            return () => socket.close()
           })
         }
       })
@@ -670,7 +671,10 @@ export default class AwsS3Multipart extends BasePlugin {
           socket.send('pause', {})
         }
         queuedRequest = this.requests.run(() => {
+          socket.open()
           socket.send('resume', {})
+
+          return () => socket.close()
         })
       })
 
@@ -715,9 +719,11 @@ export default class AwsS3Multipart extends BasePlugin {
       queuedRequest = this.requests.run(() => {
         if (file.isPaused) {
           socket.send('pause', {})
+        } else {
+          socket.open()
         }
 
-        return () => {}
+        return () => socket.close()
       })
     })
   }
diff --git a/packages/@uppy/companion-client/src/Socket.js b/packages/@uppy/companion-client/src/Socket.js
index 620fee1c2a..0a98200d72 100644
--- a/packages/@uppy/companion-client/src/Socket.js
+++ b/packages/@uppy/companion-client/src/Socket.js
@@ -24,6 +24,8 @@ export default class UppySocket {
   [Symbol.for('uppy test: getQueued')] () { return this.#queued }
 
   open () {
+    if (this.#socket != null) return
+
     this.#socket = new WebSocket(this.opts.target)
 
     this.#socket.onopen = () => {
@@ -37,6 +39,7 @@ export default class UppySocket {
 
     this.#socket.onclose = () => {
       this.#isOpen = false
+      this.#socket = null
     }
 
     this.#socket.onmessage = this.#handleMessage
diff --git a/packages/@uppy/companion/src/server/provider/dropbox/index.js b/packages/@uppy/companion/src/server/provider/dropbox/index.js
index 1b6c3ca715..11f5945f7f 100644
--- a/packages/@uppy/companion/src/server/provider/dropbox/index.js
+++ b/packages/@uppy/companion/src/server/provider/dropbox/index.js
@@ -73,6 +73,7 @@ class DropBox extends Provider {
         prefixUrl: 'https://content.dropboxapi.com/2',
         headers: {
           'Dropbox-API-Arg': httpHeaderSafeJson({ path: String(id) }),
+          Connection: 'keep-alive', // important because https://github.com/transloadit/uppy/issues/4357
         },
         body: Buffer.alloc(0), // if not, it will hang waiting for the writable stream
         responseType: 'json',
diff --git a/packages/@uppy/companion/src/standalone/index.js b/packages/@uppy/companion/src/standalone/index.js
index 93e45a8950..409f080550 100644
--- a/packages/@uppy/companion/src/standalone/index.js
+++ b/packages/@uppy/companion/src/standalone/index.js
@@ -116,7 +116,7 @@ module.exports = function server (inputCompanionOptions) {
   if (companionOptions.redisUrl) {
     const RedisStore = connectRedis(session)
     const redisClient = redis.client(companionOptions)
-    // todo next major: change default prefix to something like "companion:" and possibly remove this option
+    // todo next major: change default prefix to something like "companion-session:" and possibly remove this option
     sessionOptions.store = new RedisStore({ client: redisClient, prefix: process.env.COMPANION_REDIS_EXPRESS_SESSION_PREFIX || 'sess:' })
   }
 
diff --git a/packages/@uppy/tus/src/index.js b/packages/@uppy/tus/src/index.js
index ec3b588d8f..707136e1e1 100644
--- a/packages/@uppy/tus/src/index.js
+++ b/packages/@uppy/tus/src/index.js
@@ -496,7 +496,7 @@ export default class Tus extends BasePlugin {
     return new Promise((resolve, reject) => {
       const token = file.serverToken
       const host = getSocketHost(file.remote.companionUrl)
-      const socket = new Socket({ target: `${host}/api/${token}` })
+      const socket = new Socket({ target: `${host}/api/${token}`, autoOpen: false })
       this.uploaderSockets[file.id] = socket
       this.uploaderEvents[file.id] = new EventTracker(this.uppy)
 
@@ -519,8 +519,10 @@ export default class Tus extends BasePlugin {
           // resume a queued upload to make it skip the queue.
           queuedRequest.abort()
           queuedRequest = this.requests.run(() => {
+            socket.open()
             socket.send('resume', {})
-            return () => {}
+
+            return () => socket.close()
           })
         }
       })
@@ -545,8 +547,10 @@ export default class Tus extends BasePlugin {
           socket.send('pause', {})
         }
         queuedRequest = this.requests.run(() => {
+          socket.open()
           socket.send('resume', {})
-          return () => {}
+
+          return () => socket.close()
         })
       })
 
@@ -607,15 +611,17 @@ export default class Tus extends BasePlugin {
       queuedRequest = this.requests.run(() => {
         if (file.isPaused) {
           socket.send('pause', {})
+        } else {
+          socket.open()
         }
 
-        // Don't do anything here, the caller will take care of cancelling the upload itself
+        // Just close the socket here, the caller will take care of cancelling the upload itself
         // using resetUploaderReferences(). This is because resetUploaderReferences() has to be
         // called when this request is still in the queue, and has not been started yet, too. At
         // that point this cancellation function is not going to be called.
         // Also, we need to remove the request from the queue _without_ destroying everything
         // related to this upload to handle pauses.
-        return () => {}
+        return () => socket.close()
       })
     })
   }
diff --git a/private/dev/package.json b/private/dev/package.json
index 33a02f4683..fc4394d0aa 100644
--- a/private/dev/package.json
+++ b/private/dev/package.json
@@ -18,7 +18,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "vite --clearScreen false",
     "build": "vite build",
     "preview": "vite preview"
   }