diff --git a/services/web/app/coffee/Features/Project/ProjectEntityMongoUpdateHandler.coffee b/services/web/app/coffee/Features/Project/ProjectEntityMongoUpdateHandler.coffee
index 80d4795d22..a13eb370b1 100644
--- a/services/web/app/coffee/Features/Project/ProjectEntityMongoUpdateHandler.coffee
+++ b/services/web/app/coffee/Features/Project/ProjectEntityMongoUpdateHandler.coffee
@@ -63,7 +63,7 @@ module.exports = ProjectEntityMongoUpdateHandler = self =
 					set["#{path.mongo}._id"] = newFileRef._id
 					set["#{path.mongo}.created"] = new Date()
 					set["#{path.mongo}.linkedFileData"] = newFileRef.linkedFileData
-					set["#{path.mongo}.rev"] = 1
+					inc["#{path.mongo}.rev"] = 1
 					update =
 						"$inc": inc
 						"$set": set
diff --git a/services/web/app/coffee/Features/Project/ProjectEntityUpdateHandler.coffee b/services/web/app/coffee/Features/Project/ProjectEntityUpdateHandler.coffee
index 1d49b47934..8e269fe610 100644
--- a/services/web/app/coffee/Features/Project/ProjectEntityUpdateHandler.coffee
+++ b/services/web/app/coffee/Features/Project/ProjectEntityUpdateHandler.coffee
@@ -233,7 +233,13 @@ module.exports = ProjectEntityUpdateHandler = self =
 					url: fileStoreUrl
 				]
 				projectHistoryId = project.overleaf?.history?.id
-				TpdsUpdateSender.addFile {project_id:project._id, file_id:newFileRef._id, path:path.fileSystem, rev:newFileRef.rev+1, project_name:project.name}, (err) ->
+				# Increment the rev for an in-place update (with the same path) so the third-party-datastore
+				# knows this is a new file.
+				# Ideally we would get this from ProjectEntityMongoUpdateHandler.replaceFileWithNew
+				# but it returns the original oldFileRef (after incrementing the rev value in mongo),
+				# so we add 1 to the rev from that. This isn't atomic and relies on the lock 
+				# but it is acceptable for now.
+				TpdsUpdateSender.addFile {project_id:project._id, file_id:newFileRef._id, path:path.fileSystem, rev:oldFileRef.rev + 1, project_name:project.name}, (err) ->
 					return callback(err) if err?
 					DocumentUpdaterHandler.updateProjectStructure project_id, projectHistoryId, userId, {oldFiles, newFiles}, callback
 
diff --git a/services/web/test/unit/coffee/Project/ProjectEntityMongoUpdateHandlerTests.coffee b/services/web/test/unit/coffee/Project/ProjectEntityMongoUpdateHandlerTests.coffee
index 7dadc7dbb2..661bef2da0 100644
--- a/services/web/test/unit/coffee/Project/ProjectEntityMongoUpdateHandlerTests.coffee
+++ b/services/web/test/unit/coffee/Project/ProjectEntityMongoUpdateHandlerTests.coffee
@@ -135,8 +135,8 @@ describe 'ProjectEntityMongoUpdateHandler', ->
 				.calledWith(
 					{ _id: project_id },
 					{
-						'$inc': { 'version': 1 }
-						'$set': { 'file.png._id': @newFile._id, 'file.png.created': new Date(), 'file.png.linkedFileData': @linkedFileData, 'file.png.rev': 1 }
+						'$inc': { 'version': 1, 'file.png.rev': 1 }
+						'$set': { 'file.png._id': @newFile._id, 'file.png.created': new Date(), 'file.png.linkedFileData': @linkedFileData }
 					}
 					{}
 				)
diff --git a/services/web/test/unit/coffee/Project/ProjectEntityUpdateHandlerTests.coffee b/services/web/test/unit/coffee/Project/ProjectEntityUpdateHandlerTests.coffee
index 46403328a7..46ac50ab63 100644
--- a/services/web/test/unit/coffee/Project/ProjectEntityUpdateHandlerTests.coffee
+++ b/services/web/test/unit/coffee/Project/ProjectEntityUpdateHandlerTests.coffee
@@ -391,7 +391,7 @@ describe 'ProjectEntityUpdateHandler', ->
 			@FileStoreHandler.uploadFileFromDisk = sinon.stub().yields(null, @newFileUrl)
 
 			@newFile = _id: new_file_id, name: "dummy-upload-filename", rev: 0, linkedFileData: @linkedFileData
-			@oldFile = _id: file_id
+			@oldFile = _id: file_id, rev: 3
 			@path = "/path/to/file"
 			@ProjectEntityMongoUpdateHandler._insertDeletedFileReference = sinon.stub().yields()
 			@ProjectEntityMongoUpdateHandler.replaceFileWithNew = sinon.stub().yields(null, @oldFile, @project, fileSystem: @path)
@@ -413,7 +413,7 @@ describe 'ProjectEntityUpdateHandler', ->
 					project_id: project_id
 					project_name: @project.name
 					file_id: new_file_id
-					rev: @newFile.rev + 1
+					rev: @oldFile.rev + 1
 					path: @path
 				})
 				.should.equal true