I got it now, please ignore my previous replies. I tried the 5.x beta, right clicked on the folder I wanted to copy, chose Copy, click on Transfer settings, then clicked on the Edit button in File Mask. From there I entered the files I wanted. It works great!
One other note, I tried the 5.x beta and the mask you specified but it didn't apply the file mask to the subfolders, it was only applied to the current folder.
Let's say I want to use the WinSCP GUI to copy only the files that end in .png or .jpg from a folder called image. So basically I want to drag over the image folder and only copy those files.
The image folders contains many folders nested deep inside it, so I want WinSCP to recursively search all those nested directories for my file types as well. I want it to copy over those .png and .jpg files and place them in the same folder structure they were found in.
How can I do this using the WinSCP GUI? Thanks!