diff --git a/app/build.gradle b/app/build.gradle
index 0b594cc..7aa770b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -35,6 +35,7 @@ android {
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'com.google.android.material:material:1.1.0'
 }
 
 def props = new Properties()
diff --git a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
index 8fbf253..5919fd1 100644
--- a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
+++ b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
@@ -27,6 +27,8 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.content.Loader;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.HashMap;
@@ -96,6 +98,7 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
     private WebView mWebView;
     private TextView mTextView;
     private Toast mToast;
+    private Snackbar snackbar;
 
     private class Channel {
         @JavascriptInterface
@@ -280,18 +283,15 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
         // loader manager impl so that the result will be delivered.
         LoaderManager.getInstance(this);
 
+        snackbar = Snackbar.make(findViewById(R.id.webview), "", Snackbar.LENGTH_LONG);
+
         final Intent intent = getIntent();
         if (Intent.ACTION_VIEW.equals(intent.getAction())) {
             if (!"application/pdf".equals(intent.getType())) {
-                Log.e(TAG, "invalid mime type");
-                finish();
+                snackbar.setText(R.string.invalid_mime_type).show();
                 return;
             }
             mUri = intent.getData();
-            if ("file".equals(mUri.getScheme())) {
-                Log.e(TAG, "invalid legacy file URI: " + mUri);
-                return;
-            }
             mPage = 1;
         }
 
@@ -302,6 +302,11 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
             mDocumentOrientationDegrees = savedInstanceState.getInt(STATE_DOCUMENT_ORIENTATION_DEGREES);
         }
 
+        if ("file".equals(mUri.getScheme())) {
+            snackbar.setText(R.string.legacy_file_uri).show();
+            return;
+        }
+
         if (mUri != null) {
             loadPdf();
         }
@@ -330,7 +335,7 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
             }
             mInputStream = getContentResolver().openInputStream(mUri);
         } catch (IOException e) {
-            Log.e(TAG, "failed to open URI: " + mUri);
+            snackbar.setText(R.string.io_error).show();
             return;
         }
         mWebView.loadUrl("https://localhost/viewer.html");
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 73d046b..d8df96e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -16,4 +16,8 @@
 
     <string name="document_properties_invalid_date">Invalid date</string>
     <string name="document_properties_retrieval_failed">Failed to obtain document metadata</string>
+
+    <string name="invalid_mime_type">Cannot open file with invalid mime type</string>
+    <string name="legacy_file_uri">Cannot open legacy file paths from insecure apps</string>
+    <string name="io_error">Received I/O error trying to open content</string>
 </resources>