diff --git a/server/src/main.rs b/server/src/main.rs
index 948320a..1138d6d 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -15,20 +15,22 @@ struct FileRequest {
 }
 
 #[derive(Display, Debug, Error)]
-struct FileError {}
+struct FileError {
+	cause: String,
+}
 impl actix_web::error::ResponseError for FileError {}
 
 /// upload memo db
 async fn put(req: web::Json<FileRequest>) -> Result<String, FileError> {
-	if req.payload.len() < 20480 {
-		let fname = req.file.chars().filter(|c| c.is_alphanumeric()).collect::<String>();
+	if req.payload.len() < 51200 {
+		let fname = req.file.chars().filter(|c| c.is_alphanumeric()).collect::<String>(); // TODO base64 uses some symbols!
 		let f_res = web::block(||fs::File::create(fname)).await.unwrap();
-		if f_res.is_err() { return Err(FileError{}); }
+		if f_res.is_err() { return Err(FileError{cause:"could not create file".to_string()}); }
 		let mut f = f_res.unwrap();
 		let _res = web::block(move || f.write(base64::decode(&req.payload).unwrap().as_slice())).await.unwrap();
 		return Ok("OK".to_string());
 	} else {
-		return Err(FileError{});
+		return Err(FileError{cause:"size too big".to_string()});
 	}
 }
 
@@ -48,7 +50,7 @@ async fn get(req: web::Json<FileRequest>) -> Result<NamedFile, FileError> {
 			Err(e) => println!("[!] could not list dirs : {}", e.to_string()),
 		}
 	}
-	return Err(FileError{});
+	return Err(FileError{cause:"not found".to_string()});
 }
 
 #[actix_web::main]