diff --git a/oa/libs/webdav/file.go b/oa/libs/webdav/file.go
index 3cd19ff..df486bc 100644
--- a/oa/libs/webdav/file.go
+++ b/oa/libs/webdav/file.go
@@ -82,7 +82,7 @@ func (d Dir) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
 	if name = d.resolve(name); name == "" {
 		return os.ErrNotExist
 	}
-	return os.Mkdir(name, perm)
+	return os.MkdirAll(name, perm)
 }
 
 func (d Dir) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (File, error) {
@@ -91,6 +91,13 @@ func (d Dir) OpenFile(ctx context.Context, name string, flag int, perm os.FileMo
 	}
 	f, err := os.OpenFile(name, flag, perm)
 	if err != nil {
+		if os.IsNotExist(err) {
+			err = os.MkdirAll(filepath.Dir(name), 0777)
+			if err != nil {
+				return nil, err
+			}
+			return d.OpenFile(ctx, name, flag, perm)
+		}
 		return nil, err
 	}
 	return f, nil