diff --git a/app/src/main/java/com/simplemobiletools/gallery/Config.java b/app/src/main/java/com/simplemobiletools/gallery/Config.java
index c40f726ad..a6c1c998b 100644
--- a/app/src/main/java/com/simplemobiletools/gallery/Config.java
+++ b/app/src/main/java/com/simplemobiletools/gallery/Config.java
@@ -110,4 +110,12 @@ public class Config {
     public void setAutoplayVideos(boolean autoplay) {
         mPrefs.edit().putBoolean(Constants.AUTOPLAY_VIDEOS, autoplay).apply();
     }
+
+    public String getTreeUri() {
+        return mPrefs.getString(Constants.TREE_URI, "");
+    }
+
+    public void setTreeUri(String uri) {
+        mPrefs.edit().putString(Constants.TREE_URI, uri).apply();
+    }
 }
diff --git a/app/src/main/java/com/simplemobiletools/gallery/Constants.java b/app/src/main/java/com/simplemobiletools/gallery/Constants.java
index 429de434f..7b892bffe 100644
--- a/app/src/main/java/com/simplemobiletools/gallery/Constants.java
+++ b/app/src/main/java/com/simplemobiletools/gallery/Constants.java
@@ -18,6 +18,7 @@ public class Constants {
     public static final String HIDDEN_FOLDERS = "hidden_folders";
     public static final String SHOW_HIDDEN_FOLDERS = "show_hidden_folders";
     public static final String AUTOPLAY_VIDEOS = "autoplay_videos";
+    public static final String TREE_URI = "tree_uri";
 
     // sorting
     public static final int SORT_BY_NAME = 1;
diff --git a/app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/WritePermissionDialog.kt b/app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/WritePermissionDialog.kt
new file mode 100644
index 000000000..0000ce4ca
--- /dev/null
+++ b/app/src/main/kotlin/com/simplemobiletools/gallery/dialogs/WritePermissionDialog.kt
@@ -0,0 +1,31 @@
+package com.simplemobiletools.gallery.dialogs
+
+import android.content.Context
+import android.support.v7.app.AlertDialog
+import android.view.LayoutInflater
+import com.simplemobiletools.gallery.R
+
+class WritePermissionDialog(val context: Context, val listener: OnWritePermissionListener) {
+    var dialog: AlertDialog? = null
+
+    init {
+        val view = LayoutInflater.from(context).inflate(R.layout.dialog_write_permission, null)
+
+        dialog = AlertDialog.Builder(context)
+                .setTitle(context.resources.getString(R.string.confirm_storage_access_title))
+                .setView(view)
+                .setPositiveButton(R.string.ok, { dialog, which -> dialogConfirmed() })
+                .create()
+
+        dialog?.show()
+    }
+
+    private fun dialogConfirmed() {
+        dialog?.dismiss()
+        listener.onConfirmed()
+    }
+
+    interface OnWritePermissionListener {
+        fun onConfirmed()
+    }
+}
diff --git a/app/src/main/res/layout/dialog_write_permission.xml b/app/src/main/res/layout/dialog_write_permission.xml
new file mode 100644
index 000000000..5cb3ae03d
--- /dev/null
+++ b/app/src/main/res/layout/dialog_write_permission.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/dialog_holder"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="@dimen/activity_margin">
+
+    <TextView
+        android:id="@+id/dialog_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="@dimen/activity_margin"
+        android:text="@string/confirm_storage_access_text"/>
+
+    <ImageView
+        android:id="@+id/dialog_image"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:adjustViewBounds="true"
+        android:scaleType="fitCenter"
+        android:src="@mipmap/write_storage"/>
+
+</LinearLayout>
diff --git a/app/src/main/res/mipmap-hdpi/write_storage.png b/app/src/main/res/mipmap-hdpi/write_storage.png
new file mode 100644
index 000000000..01110d81e
Binary files /dev/null and b/app/src/main/res/mipmap-hdpi/write_storage.png differ
diff --git a/app/src/main/res/mipmap-mdpi/write_storage.png b/app/src/main/res/mipmap-mdpi/write_storage.png
new file mode 100644
index 000000000..dbdfe8f1d
Binary files /dev/null and b/app/src/main/res/mipmap-mdpi/write_storage.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/write_storage.png b/app/src/main/res/mipmap-xhdpi/write_storage.png
new file mode 100644
index 000000000..758e02a02
Binary files /dev/null and b/app/src/main/res/mipmap-xhdpi/write_storage.png differ
diff --git a/app/src/main/res/mipmap-xxhdpi/write_storage.png b/app/src/main/res/mipmap-xxhdpi/write_storage.png
new file mode 100644
index 000000000..9a7c465c9
Binary files /dev/null and b/app/src/main/res/mipmap-xxhdpi/write_storage.png differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/write_storage.png b/app/src/main/res/mipmap-xxxhdpi/write_storage.png
new file mode 100644
index 000000000..e61915498
Binary files /dev/null and b/app/src/main/res/mipmap-xxxhdpi/write_storage.png differ
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index a5af8ec51..4f5cd25c7 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Ordner verstecken</string>
     <string name="unhide_folder">Ordner sichtbar machen</string>
     <string name="hidden">(versteckt)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 Ordner gelöscht</item>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index 5d19056c7..9bf20d45a 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 carpeta eliminada</item>
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index c4f1513b0..69f46ee51 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 cartella eliminata</item>
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 6fbb04242..39b44884c 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 フォルダーを削除しました</item>
diff --git a/app/src/main/res/values-pt-rPT/strings.xml b/app/src/main/res/values-pt-rPT/strings.xml
index cc3a126c5..215411e99 100644
--- a/app/src/main/res/values-pt-rPT/strings.xml
+++ b/app/src/main/res/values-pt-rPT/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 pasta eliminada</item>
diff --git a/app/src/main/res/values-sv/strings.xml b/app/src/main/res/values-sv/strings.xml
index 710cd65c9..c1e3cc2d7 100644
--- a/app/src/main/res/values-sv/strings.xml
+++ b/app/src/main/res/values-sv/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 mapp borttagen</item>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f1f1b48fb..8f36aef60 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -35,6 +35,8 @@
     <string name="hide_folder">Hide folder</string>
     <string name="unhide_folder">Unhide folder</string>
     <string name="hidden">(hidden)</string>
+    <string name="confirm_storage_access_title">Confirm external storage access</string>
+    <string name="confirm_storage_access_text">Please choose the root folder of the SD card to grant write access on the next screen</string>
 
     <plurals name="folders_deleted">
         <item quantity="one">1 folder deleted</item>