File not found is an expected exception

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -79,6 +79,7 @@ import java.io.BufferedOutputStream;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -879,7 +880,11 @@ public class FragmentCompose extends FragmentEx {
 
             @Override
             protected void onException(Bundle args, Throwable ex) {
-                Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
+                // External app sending absolute file
+                if (ex instanceof FileNotFoundException)
+                    Snackbar.make(view, ex.getMessage(), Snackbar.LENGTH_LONG).show();
+                else
+                    Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
             }
         }.load(this, args);
     }
@@ -1491,7 +1496,11 @@ public class FragmentCompose extends FragmentEx {
 
         @Override
         protected void onException(Bundle args, Throwable ex) {
-            Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
+            // External app sending absolute file
+            if (ex instanceof FileNotFoundException)
+                Snackbar.make(view, ex.getMessage(), Snackbar.LENGTH_LONG).show();
+            else
+                Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
         }
     };