diff --git a/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src b/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
index 5fbd21fab..9315f8c53 100644
--- a/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
+++ b/apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src
@@ -1,6 +1,6 @@
 {application, emqx_plugin_libs,
  [{description, "EMQ X Plugin utility libs"},
-  {vsn, "4.4.3"},
+  {vsn, "4.4.4"},
   {modules, []},
   {applications, [kernel,stdlib]},
   {env, []}
diff --git a/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src b/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
index b183c5e0a..5a8a90d95 100644
--- a/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
+++ b/apps/emqx_plugin_libs/src/emqx_plugin_libs.appup.src
@@ -1,7 +1,11 @@
 %% -*- mode: erlang -*-
 %% Unless you know what you are doing, DO NOT edit manually!!
 {VSN,
-  [{"4.4.2",[{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]}]},
+  [
+   {"4.4.3",
+    [{load_module,emqx_trace,brutal_purge,soft_purge,[]},
+     {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}]},
+   {"4.4.2",[{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]}]},
    {"4.4.1",
     [{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]},
      {load_module,emqx_trace,brutal_purge,soft_purge,[]},
@@ -13,7 +17,11 @@
      {update,emqx_slow_subs,{advanced,["4.4.0"]}},
      {load_module,emqx_slow_subs_api,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.4.2",[{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]}]},
+  [
+   {"4.4.3",
+     [{load_module,emqx_trace,brutal_purge,soft_purge,[]},
+      {load_module,emqx_trace_api,brutal_purge,soft_purge,[]}]},
+   {"4.4.2",[{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]}]},
    {"4.4.1",
     [{load_module,emqx_plugin_libs_ssl,brutal_purge,soft_purge,[]},
      {load_module,emqx_trace,brutal_purge,soft_purge,[]},
diff --git a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
index 84673b4a7..d2c02d06d 100644
--- a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
+++ b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
@@ -226,7 +226,8 @@ handle_info({'DOWN', _Ref, process, Pid, _Reason}, State = #{monitors := Monitor
     case maps:take(Pid, Monitors) of
         error -> {noreply, State};
         {Files, NewMonitors} ->
-            lists:foreach(fun file:delete/1, Files),
+            ZipDir = emqx_trace:zip_dir(),
+            lists:foreach(fun(F) -> file:delete(filename:join([ZipDir, F])) end,  Files),
             {noreply, State#{monitors => NewMonitors}}
     end;
 handle_info({timeout, TRef, update_trace},
@@ -403,7 +404,7 @@ fill_default(Trace = #?TRACE{end_at = undefined, start_at = StartAt}) ->
     fill_default(Trace#?TRACE{end_at = StartAt + 10 * 60});
 fill_default(Trace) -> Trace.
 
--define(NAME_RE, "^[A-Za-z]+[A-Za-z0-9-_]*$").
+-define(NAME_RE, "^[0-9A-Za-z]+[A-Za-z0-9-_]*$").
 
 to_trace(#{name := Name} = Trace, Rec) ->
     case re:run(Name, ?NAME_RE) of
diff --git a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
index b8aa5c059..49321086b 100644
--- a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
+++ b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace_api.erl
@@ -97,9 +97,9 @@ download_zip_log(#{name := Name}, _Param) ->
             ZipDir = emqx_trace:zip_dir(),
             Zips = group_trace_file(ZipDir, TraceLog, TraceFiles),
             ZipFileName0 = binary_to_list(Name) ++ ".zip",
-            ZipFileName = filename:join([Zips, ZipFileName0]),
+            ZipFileName = filename:join([ZipDir, ZipFileName0]),
             {ok, ZipFile} = zip:zip(ZipFileName, Zips, [{cwd, ZipDir}]),
-            emqx_trace:delete_files_after_send(ZipFileName, Zips),
+            emqx_trace:delete_files_after_send(ZipFileName0, Zips),
             {ok, ZipFile};
         {error, Reason} ->
             {error, Reason}