Add more logging around failed backups.

app/src/main/java/androidx/documentfile/provider/DocumentFileHelper.java

@@ -0,0 +1,41 @@
+package androidx.documentfile.provider;
+
+import android.content.Context;
+import android.net.Uri;
+import android.provider.DocumentsContract;
+
+import androidx.annotation.RequiresApi;
+
+import org.signal.core.util.logging.Log;
+
+/**
+ * Located in androidx package as {@link TreeDocumentFile} is package protected.
+ */
+public class DocumentFileHelper {
+
+  private static final String TAG = Log.tag(DocumentFileHelper.class);
+
+  /**
+   * System implementation swallows the exception and we are having problems with the rename. This inlines the
+   * same call and logs the exception. Note this implementation does not update the passed in document file like
+   * the system implementation. Do not use the provided document file after calling this method.
+   *
+   * @return true if rename successful
+   */
+  @RequiresApi(21)
+  public static boolean renameTo(Context context, DocumentFile documentFile, String displayName) {
+    if (documentFile instanceof TreeDocumentFile) {
+      Log.d(TAG, "Renaming document directly");
+      try {
+        final Uri result = DocumentsContract.renameDocument(context.getContentResolver(), documentFile.getUri(), displayName);
+        return result != null;
+      } catch (Exception e) {
+        Log.w(TAG, "Unable to rename document file", e);
+        return false;
+      }
+    } else {
+      Log.d(TAG, "Letting OS rename document: " + documentFile.getClass().getSimpleName());
+      return documentFile.renameTo(displayName);
+    }
+  }
+}