diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index d2595ad6..fafad3c2 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -119,7 +119,7 @@ class ExercisesController < ApplicationController
         partial: 'export_actions',
         locals: {
           exercise: @exercise,
-          task_found: codeharbor_check[:uuid_found],
+          uuid_found: codeharbor_check[:uuid_found],
           update_right: codeharbor_check[:update_right],
           error: codeharbor_check[:error],
           exported: false,
diff --git a/app/services/proforma_service/convert_exercise_to_task.rb b/app/services/proforma_service/convert_exercise_to_task.rb
index a60cdbf8..fdc3ff6d 100644
--- a/app/services/proforma_service/convert_exercise_to_task.rb
+++ b/app/services/proforma_service/convert_exercise_to_task.rb
@@ -37,6 +37,7 @@ module ProformaService
               allow_auto_completion: @exercise.allow_auto_completion,
               expected_difficulty: @exercise.expected_difficulty,
               execution_environment_id: @exercise.execution_environment_id,
+              files: task_files_meta_data,
             },
           },
         }.compact
@@ -92,17 +93,26 @@ module ProformaService
       [
         task_file(file).tap do |t_file|
           t_file.used_by_grader = true
-          t_file.internal_description = 'teacher_defined_test'
         end,
       ]
     end
 
-    def task_files
-      @exercise.files
-        .filter do |file|
+    def exercise_files
+      @exercise.files.filter do |file|
         !file.role.in? %w[reference_implementation teacher_defined_test
                           teacher_defined_linter]
-      end.map do |file|
+      end
+    end
+
+    def task_files_meta_data
+      exercise_files.to_h do |file|
+        # added CO- to id, otherwise the key would have CodeOcean as a prefix after export and import (cause unknown)
+        ["CO-#{file.id}", {role: file.role}]
+      end
+    end
+
+    def task_files
+      exercise_files.map do |file|
         task_file(file)
       end
     end
@@ -112,8 +122,7 @@ module ProformaService
         id: file.id,
         filename: filename(file),
         usage_by_lms: file.read_only ? 'display' : 'edit',
-        visible: file.hidden ? 'no' : 'yes',
-        # internal_description: file.role || 'regular_file'
+        visible: file.hidden ? 'no' : 'yes'
       )
       add_content_to_task_file(file, task_file)
       task_file
@@ -121,8 +130,7 @@ module ProformaService
 
     def filename(file)
       if file.path.present? && file.path != '.'
-        ::File.join(file.path,
-          file.name_with_extension)
+        ::File.join(file.path, file.name_with_extension)
       else
         file.name_with_extension
       end
diff --git a/app/services/proforma_service/convert_task_to_exercise.rb b/app/services/proforma_service/convert_task_to_exercise.rb
index bf027e00..5c9bee78 100644
--- a/app/services/proforma_service/convert_task_to_exercise.rb
+++ b/app/services/proforma_service/convert_task_to_exercise.rb
@@ -21,10 +21,10 @@ module ProformaService
         user: @user,
         title: @task.title,
         description: @task.description,
-        public: @task.meta_data[:CodeOcean]&.dig(:public) == 'true',
-        hide_file_tree: @task.meta_data[:CodeOcean]&.dig(:hide_file_tree) == 'true',
-        allow_file_creation: @task.meta_data[:CodeOcean]&.dig(:allow_file_creation) == 'true',
-        allow_auto_completion: @task.meta_data[:CodeOcean]&.dig(:allow_auto_completion) == 'true',
+        public: string_to_bool(@task.meta_data[:CodeOcean]&.dig(:public)),
+        hide_file_tree: string_to_bool(@task.meta_data[:CodeOcean]&.dig(:hide_file_tree)),
+        allow_file_creation: string_to_bool(@task.meta_data[:CodeOcean]&.dig(:allow_file_creation)),
+        allow_auto_completion: string_to_bool(@task.meta_data[:CodeOcean]&.dig(:allow_auto_completion)),
         expected_difficulty: @task.meta_data[:CodeOcean]&.dig(:expected_difficulty),
         execution_environment_id: @task.meta_data[:CodeOcean]&.dig(:execution_environment_id),
 
@@ -32,6 +32,13 @@ module ProformaService
       )
     end
 
+    def string_to_bool(str)
+      return true if str == 'true'
+      return false if str == 'false'
+
+      nil
+    end
+
     def files
       model_solution_files + test_files + task_files.values
     end
@@ -68,7 +75,7 @@ module ProformaService
         hidden: file.visible == 'no',
         name: File.basename(file.filename, '.*'),
         read_only: file.usage_by_lms != 'edit',
-        role: 'regular_file',
+        role: @task.meta_data[:CodeOcean]&.dig(:files)&.dig("CO-#{file.id}".to_sym)&.dig(:role) || 'regular_file',
         path: File.dirname(file.filename).in?(['.', '']) ? nil : File.dirname(file.filename)
       )
       if file.binary
diff --git a/app/views/exercises/_export_actions.html.slim b/app/views/exercises/_export_actions.html.slim
index 72029aee..73993cb9 100644
--- a/app/views/exercises/_export_actions.html.slim
+++ b/app/views/exercises/_export_actions.html.slim
@@ -4,7 +4,7 @@
     = t('exercises.export_codeharbor.buttons.retry')
 - else
   - unless exported
-    - if !task_found || update_right
+    - if !uuid_found || update_right
       = button_tag type: 'button', class:'btn btn-primary float-end export-action export-button', data: {exercise_id: exercise.id} do
         i.fa-solid.fa-check.confirm-icon
         = t('exercises.export_codeharbor.buttons.export')
diff --git a/spec/controllers/exercises_controller_spec.rb b/spec/controllers/exercises_controller_spec.rb
index 9ca7aa9f..d0e9768a 100644
--- a/spec/controllers/exercises_controller_spec.rb
+++ b/spec/controllers/exercises_controller_spec.rb
@@ -387,7 +387,7 @@ describe ExercisesController do
 
     let(:post_request) { post :export_external_check, params: {id: exercise.id} }
     let!(:codeharbor_link) { create(:codeharbor_link, user: user) }
-    let(:external_check_hash) { {message: message, task_found: true, update_right: update_right, error: error} }
+    let(:external_check_hash) { {message: message, uuid_found: true, update_right: update_right, error: error} }
     let(:message) { 'message' }
     let(:update_right) { true }
     let(:error) { nil }
@@ -436,7 +436,7 @@ describe ExercisesController do
     end
   end
 
-  describe '#export_external_confirm' do
+  describe 'POST #export_external_confirm' do
     render_views
 
     let!(:codeharbor_link) { create(:codeharbor_link, user: user) }
@@ -473,7 +473,7 @@ describe ExercisesController do
     end
   end
 
-  describe '#import_uuid_check' do
+  describe 'POST #import_uuid_check' do
     let(:exercise) { create(:dummy, uuid: SecureRandom.uuid) }
     let!(:codeharbor_link) { create(:codeharbor_link, user: user) }
     let(:uuid) { exercise.reload.uuid }
@@ -486,7 +486,7 @@ describe ExercisesController do
       post_request
       expect(response).to have_http_status(:success)
 
-      expect(JSON.parse(response.body).symbolize_keys[:exercise_found]).to be true
+      expect(JSON.parse(response.body).symbolize_keys[:uuid_found]).to be true
       expect(JSON.parse(response.body).symbolize_keys[:update_right]).to be true
     end
 
@@ -506,7 +506,7 @@ describe ExercisesController do
         post_request
         expect(response).to have_http_status(:success)
 
-        expect(JSON.parse(response.body).symbolize_keys[:exercise_found]).to be true
+        expect(JSON.parse(response.body).symbolize_keys[:uuid_found]).to be true
         expect(JSON.parse(response.body).symbolize_keys[:update_right]).to be false
       end
     end
@@ -518,7 +518,7 @@ describe ExercisesController do
         post_request
         expect(response).to have_http_status(:success)
 
-        expect(JSON.parse(response.body).symbolize_keys[:exercise_found]).to be false
+        expect(JSON.parse(response.body).symbolize_keys[:uuid_found]).to be false
       end
     end
   end
diff --git a/spec/services/exercise_service/check_external_spec.rb b/spec/services/exercise_service/check_external_spec.rb
index 3dffeae4..4244e85b 100644
--- a/spec/services/exercise_service/check_external_spec.rb
+++ b/spec/services/exercise_service/check_external_spec.rb
@@ -42,25 +42,25 @@ describe ExerciseService::CheckExternal do
     end
 
     context 'when response contains a JSON with expected keys' do
-      let(:response) { {task_found: true, update_right: true}.to_json }
+      let(:response) { {uuid_found: true, update_right: true}.to_json }
 
       it 'returns the correct hash' do
-        expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.task_found'), task_found: true, update_right: true)
+        expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.task_found'), uuid_found: true, update_right: true)
       end
 
-      context 'with task_found: false and no update_right' do
-        let(:response) { {task_found: false}.to_json }
+      context 'with uuid_found: false and no update_right' do
+        let(:response) { {uuid_found: false}.to_json }
 
         it 'returns the correct hash' do
-          expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.no_task'), task_found: false)
+          expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.no_task'), uuid_found: false)
         end
       end
 
-      context 'with task_found: true and update_right: false' do
-        let(:response) { {task_found: true, update_right: false}.to_json }
+      context 'with uuid_found: true and update_right: false' do
+        let(:response) { {uuid_found: true, update_right: false}.to_json }
 
         it 'returns the correct hash' do
-          expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.task_found_no_right'), task_found: true, update_right: false)
+          expect(check_external_service).to eql(error: false, message: I18n.t('exercises.export_codeharbor.check.task_found_no_right'), uuid_found: true, update_right: false)
         end
       end
     end
diff --git a/spec/services/proforma_service/convert_exercise_to_task_spec.rb b/spec/services/proforma_service/convert_exercise_to_task_spec.rb
index 0fffcf59..f43d2f41 100644
--- a/spec/services/proforma_service/convert_exercise_to_task_spec.rb
+++ b/spec/services/proforma_service/convert_exercise_to_task_spec.rb
@@ -39,7 +39,13 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
         language: described_class::DEFAULT_LANGUAGE,
         meta_data: {
           CodeOcean: {
-            instructions: exercise.instructions,
+            allow_auto_completion: exercise.allow_auto_completion,
+            allow_file_creation: exercise.allow_file_creation,
+            execution_environment_id: exercise.execution_environment_id,
+            expected_difficulty: exercise.expected_difficulty,
+            hide_file_tree: exercise.hide_file_tree,
+            public: exercise.public,
+            files: {},
           },
         },
         # parent_uuid: exercise.clone_relations.first&.origin&.uuid,
@@ -62,7 +68,15 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
           usage_by_lms: 'edit',
           visible: 'yes',
           binary: false,
-          internal_description: 'main_file'
+          internal_description: nil
+        )
+      end
+
+      it 'adds the file\'s role to the file hash in task-meta_data' do
+        expect(task).to have_attributes(
+          meta_data: {
+            CodeOcean: a_hash_including(files: {"CO-#{file.id}" => {role: 'main_file'}}),
+          }
         )
       end
     end
@@ -82,7 +96,15 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
           usage_by_lms: 'display',
           visible: 'no',
           binary: false,
-          internal_description: 'regular_file'
+          internal_description: nil
+        )
+      end
+
+      it 'adds the file\'s role to the file hash in task-meta_data' do
+        expect(task).to have_attributes(
+          meta_data: {
+            CodeOcean: a_hash_including(files: {"CO-#{file.id}" => {role: 'regular_file'}}),
+          }
         )
       end
 
@@ -139,7 +161,7 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
           usage_by_lms: 'display',
           visible: 'yes',
           binary: false,
-          internal_description: 'reference_implementation'
+          internal_description: nil
         )
       end
     end
@@ -168,8 +190,8 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
           files: have(1).item,
           meta_data: {
             CodeOcean: {
-              'entry-point': test_file.filepath,
               'feedback-message': 'feedback_message',
+              weight: test_file.weight,
             },
           }
         )
@@ -183,7 +205,7 @@ RSpec.describe ProformaService::ConvertExerciseToTask do
           used_by_grader: true,
           visible: 'no',
           binary: false,
-          internal_description: 'teacher_defined_test'
+          internal_description: nil
         )
       end
 
diff --git a/spec/services/proforma_service/convert_task_to_exercise_spec.rb b/spec/services/proforma_service/convert_task_to_exercise_spec.rb
index 29c5f431..071c3472 100644
--- a/spec/services/proforma_service/convert_task_to_exercise_spec.rb
+++ b/spec/services/proforma_service/convert_task_to_exercise_spec.rb
@@ -38,32 +38,54 @@ describe ProformaService::ConvertTaskToExercise do
         uuid: 'uuid',
         parent_uuid: 'parent_uuid',
         language: 'language',
-        meta_data: {
-          CodeOcean: {
-            instructions: 'instructions',
-          },
-        },
+        meta_data: meta_data,
         model_solutions: model_solutions,
         files: files,
         tests: tests
       )
     end
     let(:user) { create(:teacher) }
+
     let(:files) { [] }
     let(:tests) { [] }
     let(:model_solutions) { [] }
     let(:exercise) { nil }
 
+    let(:meta_data) do
+      {
+        CodeOcean: {
+          public: public,
+          hide_file_tree: hide_file_tree,
+          allow_file_creation: allow_file_creation,
+          allow_auto_completion: allow_auto_completion,
+          expected_difficulty: expected_difficulty,
+          execution_environment_id: execution_environment.id,
+          files: files_meta_data,
+        },
+      }
+    end
+    let(:public) { 'true' }
+    let(:hide_file_tree) { 'true' }
+    let(:allow_file_creation) { 'true' }
+    let(:allow_auto_completion) { 'true' }
+    let(:expected_difficulty) { 7 }
+    let!(:execution_environment) { create(:java) }
+    let(:files_meta_data) { {} }
+
     it 'creates an exercise with the correct attributes' do
       expect(convert_to_exercise_service).to have_attributes(
         title: 'title',
         description: 'description',
-        instructions: 'instructions',
-        execution_environment: be_blank,
         uuid: be_blank,
         unpublished: true,
         user: user,
-        files: be_empty
+        files: be_empty,
+        public: true,
+        hide_file_tree: true,
+        allow_file_creation: true,
+        allow_auto_completion: true,
+        expected_difficulty: 7,
+        execution_environment_id: execution_environment.id
       )
     end
 
@@ -311,8 +333,7 @@ describe ProformaService::ConvertTaskToExercise do
         create(
           :files,
           title: 'exercise-title',
-          description: 'exercise-description',
-          instructions: 'exercise-instruction'
+          description: 'exercise-description'
         )
       end
 
@@ -324,7 +345,6 @@ describe ProformaService::ConvertTaskToExercise do
           id: exercise.id,
           title: task.title,
           description: task.description,
-          instructions: task.meta_data[:CodeOcean][:instructions],
           execution_environment: exercise.execution_environment,
           uuid: exercise.uuid,
           user: exercise.user,