diff --git a/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerAction.kt b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerAction.kt
new file mode 100644
index 0000000000..8c9ca1e1ad
--- /dev/null
+++ b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerAction.kt
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.media
+
+import im.vector.app.core.platform.VectorViewModelAction
+import java.io.File
+
+sealed class VectorAttachmentViewerAction : VectorViewModelAction {
+    data class DownloadMedia(val file: File) : VectorAttachmentViewerAction()
+}
diff --git a/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerActivity.kt b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerActivity.kt
index 2c51bf0947..b37a0dd361 100644
--- a/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerActivity.kt
@@ -273,9 +273,12 @@ class VectorAttachmentViewerActivity : AttachmentViewerActivity(), AttachmentInt
     //  check if it is already possible to save from menu with long press on video
     override fun onDownload() {
         // TODO
-        //  create ViewModel with action downloadAction, events downloading, downloaded, error
-        //  call usecase using viewModel
+        //  call usecase using viewModel into handle method
         //  launch coroutine in Activity using repeatOnLifeCycle extension
+        //  call ViewModel.handle inside this method
+        //  show message on error event: see TimelineFragment
+        //  check write file permissions: see TimelineFragment
+        //  should we check if media is saveable?
         //  add unit tests for usecase?
         TODO("Not yet implemented")
     }
diff --git a/library/attachment-viewer/src/main/java/im/vector/lib/attachmentviewer/AttachmentViewerViewModel.kt b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewEvents.kt
similarity index 63%
rename from library/attachment-viewer/src/main/java/im/vector/lib/attachmentviewer/AttachmentViewerViewModel.kt
rename to vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewEvents.kt
index fbb46d4348..8d0c376dd5 100644
--- a/library/attachment-viewer/src/main/java/im/vector/lib/attachmentviewer/AttachmentViewerViewModel.kt
+++ b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewEvents.kt
@@ -1,6 +1,5 @@
 /*
  * Copyright (c) 2020 New Vector Ltd
- * Copyright (C) 2018 stfalcon.com
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,8 +14,12 @@
  * limitations under the License.
  */
 
-package im.vector.lib.attachmentviewer
+package im.vector.app.features.media
 
-class AttachmentViewerViewModel {
+import im.vector.app.core.platform.VectorViewEvents
 
+sealed class VectorAttachmentViewerViewEvents : VectorViewEvents {
+    object DownloadingMedia : VectorAttachmentViewerViewEvents()
+    object MediaDownloaded : VectorAttachmentViewerViewEvents()
+    object ErrorDownloadingMedia : VectorAttachmentViewerViewEvents()
 }
diff --git a/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewModel.kt b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewModel.kt
new file mode 100644
index 0000000000..e6d86d2e7c
--- /dev/null
+++ b/vector/src/main/java/im/vector/app/features/media/VectorAttachmentViewerViewModel.kt
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2020 New Vector Ltd
+ * Copyright (C) 2018 stfalcon.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.media
+
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import im.vector.app.core.di.MavericksAssistedViewModelFactory
+import im.vector.app.core.platform.VectorDummyViewState
+import im.vector.app.core.platform.VectorViewModel
+
+class VectorAttachmentViewerViewModel @AssistedInject constructor(
+        @Assisted initialState: VectorDummyViewState
+) : VectorViewModel<VectorDummyViewState, VectorAttachmentViewerAction, VectorAttachmentViewerViewEvents>(initialState) {
+
+    /* ==========================================================================================
+     * Factory
+     * ========================================================================================== */
+
+    @AssistedFactory
+    interface Factory : MavericksAssistedViewModelFactory<VectorAttachmentViewerViewModel, VectorDummyViewState> {
+        override fun create(initialState: VectorDummyViewState): VectorAttachmentViewerViewModel
+    }
+
+    /* ==========================================================================================
+     * Specialization
+     * ========================================================================================== */
+
+    override fun handle(action: VectorAttachmentViewerAction) {
+        TODO("Not yet implemented")
+    }
+}