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faq_synchronize 2008-09-28		faq_synchronize 2024-01-22 (current)
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	* Changed files are transferred only sometimes.		* Changed files are transferred only sometimes.

-	In all above cases the problems is usually caused by WinSCP not correctly [[timestamp\|converting timestamps]] from local conventions to remote server conventions and vice versa.	+	~~AD~~

-	Also due to lack of support for [[ui_transfer#common_options\|preserving timestamps]] of uploaded files with [[protocols#ftp\|FTP protocol]], usage of synchronization in local to remote direction is limited with the protocol.	+	Actions/Checks to do to resolve the synchronization problems:
-		+	* In all above cases the problems is usually caused by WinSCP not correctly [[timestamp\|converting timestamps]] from local conventions to remote server conventions and vice versa.
-	See [[timestamp\|documentation]] to learn about possible problems with timestamps.	+	* See [[timestamp\|documentation]] to learn about other possible problems with timestamps.
		+	* Learn how to [[troubleshooting#timestamps\|troubleshoot issues with timestamps]].
		+	* Also with [[ftp\|FTP]] and [[webdav\|WebDAV]] protocols, the server may not support [[ui_transfer_custom#common\|preserving timestamps]] of uploaded files. Usage of synchronization in local to remote direction is limited then.
		+	* Also note that [[ui_transfer_custom#filename_modification\|filename modification]] logic for file transfers applies also, when comparing files for synchronization. So file names with special characters that are seemingly different may actually be considered the same by WinSCP.
		+	··* Another possibility is that you have enabled [[ui_synchronize#criteria\|//Size// synchronization criteria]] and also //Text// (or //Automatic//) [[transfer_mode\|transfer mode]]. Those cannot work together, as file size changes in the //Text// transfer mode.