I have added this issue to the tracker:
Issue 2120 – Consistent behavior across protocols when renaming/moving remote files
I'm sending you an email with a development version of WinSCP to the address you have used to register on this forum.

OK, I'll look at this. FTP is different to default SFTP in this. SFTP won't allow rename over an
existing file, that's why WinSCP does not ask.

I'm using FTP with No Encryption, which I have been using forever...

What protocol are you using?

On my WWW site I have a folder (pix1) which contains pictures, i.e., pix1.jpg, pix2.jpg, pix3.jpg, etc.

In that folder is a folder (pixbig) which also contains bigger versions of the same pictures, with the same names as those above.

If I go into the pixbig folder, select all and drag everything up to the top of the screen where there is the .. meaning "the directory above" and drop the bigger pictures, it will move everything to the pix1 directory.

But in doing so, it overwrites everything in the pix1 directory. Although I really want to do this, there is no warning like "do you really want to overwrite these files," just in case I really wanted to move the pix1 stuff away first. Is it possible to do implement a warning like this?