how Check exist file on the server and after save file

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
And I have no idea what that means - it's probably a translation problem, but the sentence with the question mark just isn't English! :laugh:
Try to explain in longer sentences, or write it in your native language and use Google Translate to convert it - at the moment, I can't begin to guess what the problem is.
Use the "Improve question" widget to edit your question and provide better information.