diff --git a/ahserver/filestorage.py b/ahserver/filestorage.py
index 342001a..d7f05e3 100755
--- a/ahserver/filestorage.py
+++ b/ahserver/filestorage.py
@@ -105,18 +105,30 @@ class FileStorage:
 					name))
 		return path
 
+	def remove(self, path):
+		try:
+			if path[0] == '/':
+				path = path[1:]
+			p = os.path.join(self.root, path)
+			os.remove(p)
+		except Exception as e:
+			exception(f'{path=}, {p=} remove error')
+			
 	async def save(self,name,read_data, userid=None):
 		p = self._name2path(name, userid=userid)
 		fpath = p[len(self.root):]
 		info(f'{p=}, {fpath=},{self.root} ')
 		_mkdir(os.path.dirname(p))
-		if isinstance(read_data, str):
-			b = read_data.encode('utf-8')
+		if isinstance(read_data, str) or isinstance(read_data, bytes):
+			b = read_data
+			if isinstance(read_data, str):
+				b = read_data.encode('utf-8')
 			async with aiofiles.open(p, 'wb') as f:
 				await f.write(b)
 				await f.flush()
 			self.tfr.newtmpfile(fpath)		
 			return fpath
+
 		async with aiofiles.open(p,'wb') as f:
 			siz = 0
 			while 1:
diff --git a/ahserver/globalEnv.py b/ahserver/globalEnv.py
index f1b4561..aedfd3f 100755
--- a/ahserver/globalEnv.py
+++ b/ahserver/globalEnv.py
@@ -34,7 +34,7 @@ from .xlsxData import XLSXData
 from .uriop import URIOp
 from .error import Success, Error, NeedLogin, NoPermission
 from .filetest import current_fileno
-
+from .filestorage import FileStorage
 from .serverenv import ServerEnv
 
 def data2xlsx(rows,headers=None):
@@ -57,6 +57,11 @@ def data2xlsx(rows,headers=None):
 	wb.close()
 	return name
 	
+async def save_file(str_or_bytes, filename):
+	fs = FileStorage()
+	r = await fs.save(filename, str_or_bytes)
+	return r
+
 class FileOutZone(Exception):
 	def __init__(self,fp,*args,**kwargs):
 		super(FileOutZone,self).__init__(*args,**kwargs)
@@ -193,6 +198,7 @@ def initEnv():
 	g.DictObject = DictObject
 	g.async_sleep = asyncio.sleep
 	g.quotedstr = quotedstr
+	g.save_file = save_file
 
 def set_builtins():
 	all_builtins = [ i for i in dir(builtins) if not i.startswith('_')]