Windows 10: Folder Copy with specific requirements

OK. I have two folders. They basically have the same filenames but with different number of files. The first folder has the correct size files but has more files than the second folder. The second folder has exactly the correct number of files but they are all smaller sizes. I want to copy all the files from folder1 only if the filename is in folder2. I don't want to copy files which are not in folder2. How to do this? All the directory sync programs I've tried have all been too complicated for me to understand. I need some help in how I should update folder2. Some recommendations would be helpful. I'm assuming this cannot be performed natively in Windows10.

:)

 

Java.nio.file - Copying files

You can't copy a folder, thats why it generates an exception (you are trying to copy a folder using a copy file function).
You probably need to list all the files inside that folder and copy one by one

 

Java.nio.file - Copying files

Issue was the above, so thanks temp02.

 

acceess denied to specific folder

ohh thanks god finaly i made it i download a free software name treesize portable version and run it as admin then i select drive and scan when list open it show me my hidden folder which i copy to another place then delete hidden folder.and save my spce thanks all to your answer