create backup only when receiver found

include/client.hpp

@@ -1,12 +1,11 @@
-#include <filesystem>
 #include <string>
-namespace fs = std::filesystem;
-using path = fs::path;
+#include <switch.h>
 
-int transfer_files(path directory);
+int transfer_files(size_t index, AccountUid uid);
 bool isClientTransferDone();
 bool isClientTransferCancelled();
 bool isClientConnectionFailed();
 void cancelClientTransfer();
 double getClientProgress();
 std::string getClientStatusText();
+std::string getClientFailReason();