diff --git a/services/web/app/src/Features/Notifications/NotificationsBuilder.js b/services/web/app/src/Features/Notifications/NotificationsBuilder.js
index 9e884bbcf9..cde8c09a4f 100644
--- a/services/web/app/src/Features/Notifications/NotificationsBuilder.js
+++ b/services/web/app/src/Features/Notifications/NotificationsBuilder.js
@@ -154,5 +154,34 @@ module.exports = {
         return NotificationsHandler.markAsReadWithKey(userId, key, callback)
       }
     }
+  },
+
+  tpdsFileLimit(user_id) {
+    return {
+      key: `tpdsFileLimit-${user_id}`,
+      create(projectName, callback) {
+        if (callback == null) {
+          callback = function() {}
+        }
+        const messageOpts = {
+          projectName: projectName
+        }
+        return NotificationsHandler.createNotification(
+          user_id,
+          this.key,
+          'notification_tpds_file_limit',
+          messageOpts,
+          null,
+          true,
+          callback
+        )
+      },
+      read(callback) {
+        if (callback == null) {
+          callback = function() {}
+        }
+        return NotificationsHandler.markAsReadByKeyOnly(this.key, callback)
+      }
+    }
   }
 }
diff --git a/services/web/app/src/Features/ThirdPartyDataStore/TpdsController.js b/services/web/app/src/Features/ThirdPartyDataStore/TpdsController.js
index 03f9eec5d3..ab8b4bd9df 100644
--- a/services/web/app/src/Features/ThirdPartyDataStore/TpdsController.js
+++ b/services/web/app/src/Features/ThirdPartyDataStore/TpdsController.js
@@ -1,8 +1,8 @@
 /* eslint-disable
-    camelcase,
-    handle-callback-err,
-    max-len,
-*/
+   camelcase,
+   handle-callback-err,
+   max-len,
+ */
 // TODO: This file was created by bulk-decaffeinate.
 // Fix any style issues and re-enable lint.
 /*
@@ -17,6 +17,7 @@ const UpdateMerger = require('./UpdateMerger')
 const logger = require('logger-sharelatex')
 const Path = require('path')
 const metrics = require('metrics-sharelatex')
+const NotificationsBuilder = require('../Notifications/NotificationsBuilder')
 
 module.exports = {
   // mergeUpdate and deleteUpdate are used by Dropbox, where the project is only passed as the name, as the
@@ -41,6 +42,13 @@ module.exports = {
               'tpds update failed to be processed, too many requests'
             )
             return res.sendStatus(429)
+          } else if (err.message === 'project_has_too_many_files') {
+            logger.warn(
+              { err, user_id, filePath },
+              'tpds trying to append to project over file limit'
+            )
+            NotificationsBuilder.tpdsFileLimit(user_id).create(projectName)
+            return res.sendStatus(400)
           } else {
             logger.err(
               { err, user_id, filePath },
diff --git a/services/web/app/views/project/list/notifications.pug b/services/web/app/views/project/list/notifications.pug
index be1763dd3e..19446e602a 100644
--- a/services/web/app/views/project/list/notifications.pug
+++ b/services/web/app/views/project/list/notifications.pug
@@ -39,10 +39,10 @@
 					ng-switch-when="notification_ip_matched_affiliation"
 				)
 					.notification-body
-						| It looks like you're at 
+						| It looks like you're at
 						strong {{ notification.messageOpts.university_name }}! <br/>
 						|	Did you know that {{notification.messageOpts.university_name}} is providing
-						strong  free Overleaf Professional accounts 
+						strong  free Overleaf Professional accounts
 						|	 to everyone at {{notification.messageOpts.university_name}}? <br/>
 						|	Add an institutional email address to claim your account.
 					.notification-action
@@ -53,6 +53,22 @@
 							span(aria-hidden="true") &times;
 							span.sr-only #{translate("close")}
 
+				.alert.alert-danger(
+					ng-switch-when="notification_tpds_file_limit"
+				)
+					.notification-body
+						| Error: Your project
+						strong  {{ notification.messageOpts.projectName }}
+						|	has gone over the 2000 file limit using an integration (e.g. Dropbox or Github) <br/>
+						| Please decrease the size of your project to prevent further errors.
+					.notification-action
+						a.pull-right.btn.btn-sm.btn-info(href="/user/settings")
+							| Account Settings
+					.notification-close
+						button.btn-sm(ng-click="dismiss(notification)").close.pull-right
+							span(aria-hidden="true") &times;
+							span.sr-only #{translate("close")}
+
 				.alert.alert-info(
 					ng-switch-default
 				)
@@ -98,7 +114,7 @@
 					ng-switch-when="notification_institution_sso_non_canonical"
 				)
 					.notification-body
-						div 
+						div
 							i.fa.fa-fw.fa-exclamation-triangle(aria-hidden="true")
 							| !{translate("tried_to_log_in_with_email", {email: "{{notification.requestedEmail}}"})} !{translate("in_order_to_match_institutional_metadata_associated", {email: "{{notification.institutionEmail}}"})}
 					.notification-close
@@ -124,7 +140,7 @@
 					ng-switch-when="notification_institution_sso_linked_by_another"
 				)
 					.notification-body
-						div 
+						div
 							i.fa.fa-fw.fa-exclamation-triangle(aria-hidden="true")
 							| !{translate("institution_account_tried_to_add_already_registered")}
 					.notification-close
@@ -152,4 +168,4 @@
 				.notification-body
 					i.fa.fa-spinner.fa-spin(aria-hidden="true")
 					|
-					| #{translate('resending_confirmation_email')}&hellip;
\ No newline at end of file
+					| #{translate('resending_confirmation_email')}&hellip;
diff --git a/services/web/test/unit/src/ThirdPartyDataStore/TpdsControllerTests.js b/services/web/test/unit/src/ThirdPartyDataStore/TpdsControllerTests.js
index bee16feede..4adbf25104 100644
--- a/services/web/test/unit/src/ThirdPartyDataStore/TpdsControllerTests.js
+++ b/services/web/test/unit/src/ThirdPartyDataStore/TpdsControllerTests.js
@@ -28,6 +28,9 @@ describe('TpdsController', function() {
       requires: {
         './TpdsUpdateHandler': this.TpdsUpdateHandler,
         './UpdateMerger': (this.UpdateMerger = {}),
+        '../Notifications/NotificationsBuilder': (this.NotificationsBuilder = {
+          tpdsFileLimit: sinon.stub().returns({ create: sinon.stub() })
+        }),
         'logger-sharelatex': {
           log() {},
           warn() {},
@@ -95,6 +98,31 @@ describe('TpdsController', function() {
       res.sendStatus.calledWith(500).should.equal(true)
     })
 
+    it('should return a 400 error when the project is too big', function() {
+      const path = '/projectName/here.txt'
+      const req = {
+        pause() {},
+        params: { 0: path, user_id: this.user_id, projectName: 'projectName' },
+        session: {
+          destroy() {}
+        },
+        headers: {
+          'x-sl-update-source': (this.source = 'dropbox')
+        }
+      }
+      this.TpdsUpdateHandler.newUpdate = sinon
+        .stub()
+        .callsArgWith(5, { message: 'project_has_too_many_files' })
+      const res = {
+        sendStatus: sinon.stub()
+      }
+      this.TpdsController.mergeUpdate(req, res)
+      res.sendStatus.calledWith(400).should.equal(true)
+      this.NotificationsBuilder.tpdsFileLimit
+        .calledWith(this.user_id)
+        .should.equal(true)
+    })
+
     it('should return a 429 error when the update receiver fails due to too many requests error', function() {
       const path = '/projectName/here.txt'
       const req = {