diff --git a/services/web/app/src/Features/LinkedFiles/LinkedFilesController.js b/services/web/app/src/Features/LinkedFiles/LinkedFilesController.js
index 8f8b785a37..6970bccff8 100644
--- a/services/web/app/src/Features/LinkedFiles/LinkedFilesController.js
+++ b/services/web/app/src/Features/LinkedFiles/LinkedFilesController.js
@@ -1,6 +1,5 @@
 /* eslint-disable
     max-len,
-    no-unused-vars,
 */
 // TODO: This file was created by bulk-decaffeinate.
 // Fix any style issues and re-enable lint.
@@ -13,10 +12,7 @@
  */
 let LinkedFilesController
 const SessionManager = require('../Authentication/SessionManager')
-const EditorController = require('../Editor/EditorController')
-const ProjectLocator = require('../Project/ProjectLocator')
 const Settings = require('@overleaf/settings')
-const logger = require('@overleaf/logger')
 const _ = require('lodash')
 const AnalyticsManager = require('../../../../app/src/Features/Analytics/AnalyticsManager')
 const LinkedFilesHandler = require('./LinkedFilesHandler')
@@ -45,8 +41,9 @@ const Modules = require('../../infrastructure/Modules')
 const { plainTextResponse } = require('../../infrastructure/Response')
 const ReferencesHandler = require('../References/ReferencesHandler')
 const EditorRealTimeController = require('../Editor/EditorRealTimeController')
+const { expressify } = require('@overleaf/promise-utils')
 
-function createLinkedFile(req, res, next) {
+async function createLinkedFile(req, res, next) {
   const { project_id: projectId } = req.params
   const { name, provider, data, parent_folder_id: parentFolderId } = req.body
   const userId = SessionManager.getLoggedInUserId(req.session)
@@ -59,94 +56,91 @@ function createLinkedFile(req, res, next) {
   data.provider = provider
   data.importedAt = new Date().toISOString()
 
-  return Agent.createLinkedFile(
-    projectId,
-    data,
-    name,
-    parentFolderId,
-    userId,
-    function (err, newFileId) {
-      if (err != null) {
-        return LinkedFilesController.handleError(err, req, res, next)
-      }
-      if (name.endsWith('.bib')) {
-        AnalyticsManager.recordEventForUserInBackground(
-          userId,
-          'linked-bib-file',
-          {
-            integration: provider,
-          }
-        )
-      }
-      return res.json({ new_file_id: newFileId })
-    }
-  )
-}
-
-function refreshLinkedFile(req, res, next) {
-  const { project_id: projectId, file_id: fileId } = req.params
-  const userId = SessionManager.getLoggedInUserId(req.session)
-
-  return LinkedFilesHandler.getFileById(
-    projectId,
-    fileId,
-    function (err, file, path, parentFolder) {
-      if (err != null) {
-        return next(err)
-      }
-      if (file == null) {
-        return res.sendStatus(404)
-      }
-      const { name } = file
-      const { linkedFileData } = file
-      if (
-        linkedFileData == null ||
-        (linkedFileData != null ? linkedFileData.provider : undefined) == null
-      ) {
-        return res.sendStatus(409)
-      }
-      const { provider } = linkedFileData
-      const parentFolderId = parentFolder._id
-      const Agent = LinkedFilesController._getAgent(provider)
-      if (Agent == null) {
-        return res.sendStatus(400)
-      }
-
-      linkedFileData.importedAt = new Date().toISOString()
-
-      Agent.refreshLinkedFile(
-        projectId,
-        linkedFileData,
-        name,
-        parentFolderId,
+  try {
+    const newFileId = await Agent.promises.createLinkedFile(
+      projectId,
+      data,
+      name,
+      parentFolderId,
+      userId
+    )
+    if (name.endsWith('.bib')) {
+      AnalyticsManager.recordEventForUserInBackground(
         userId,
-        function (err, newFileId) {
-          if (err != null) {
-            return LinkedFilesController.handleError(err, req, res, next)
-          }
-          if (req.body.shouldReindexReferences) {
-            ReferencesHandler.indexAll(projectId, function (error, data) {
-              if (error) {
-                OError.tag(error, 'failed to index references', {
-                  projectId,
-                })
-                return next(error)
-              }
-              EditorRealTimeController.emitToRoom(
-                projectId,
-                'references:keys:updated',
-                data.keys,
-                true
-              )
-              res.json({ new_file_id: newFileId })
-            })
-          } else {
-            res.json({ new_file_id: newFileId })
-          }
+        'linked-bib-file',
+        {
+          integration: provider,
         }
       )
     }
+    return res.json({ new_file_id: newFileId })
+  } catch (err) {
+    return LinkedFilesController.handleError(err, req, res, next)
+  }
+}
+
+async function refreshLinkedFile(req, res, next) {
+  const { project_id: projectId, file_id: fileId } = req.params
+  const userId = SessionManager.getLoggedInUserId(req.session)
+
+  const { file, parentFolder } = await LinkedFilesHandler.promises.getFileById(
+    projectId,
+    fileId
   )
+
+  if (file == null) {
+    return res.sendStatus(404)
+  }
+  const { name } = file
+  const { linkedFileData } = file
+  if (
+    linkedFileData == null ||
+    (linkedFileData != null ? linkedFileData.provider : undefined) == null
+  ) {
+    return res.sendStatus(409)
+  }
+
+  const { provider } = linkedFileData
+  const parentFolderId = parentFolder._id
+  const Agent = LinkedFilesController._getAgent(provider)
+  if (Agent == null) {
+    return res.sendStatus(400)
+  }
+
+  linkedFileData.importedAt = new Date().toISOString()
+  let newFileId
+  try {
+    newFileId = await Agent.promises.refreshLinkedFile(
+      projectId,
+      linkedFileData,
+      name,
+      parentFolderId,
+      userId
+    )
+  } catch (err) {
+    return LinkedFilesController.handleError(err, req, res, next)
+  }
+
+  if (req.body.shouldReindexReferences) {
+    let data
+    try {
+      data = await ReferencesHandler.promises.indexAll(projectId)
+    } catch (error) {
+      OError.tag(error, 'failed to index references', {
+        projectId,
+      })
+      return next(error)
+    }
+    EditorRealTimeController.emitToRoom(
+      projectId,
+      'references:keys:updated',
+      data.keys,
+      true
+    )
+    res.json({ new_file_id: newFileId })
+  } else {
+    res.json({ new_file_id: newFileId })
+  }
 }
 
 module.exports = LinkedFilesController = {
@@ -174,9 +168,9 @@ module.exports = LinkedFilesController = {
     return LinkedFilesController.Agents[provider]
   },
 
-  createLinkedFile,
+  createLinkedFile: expressify(createLinkedFile),
 
-  refreshLinkedFile,
+  refreshLinkedFile: expressify(refreshLinkedFile),
 
   handleError(error, req, res, next) {
     if (error instanceof AccessDeniedError) {