No, that's not what my posting is about.
DNN 6, SC 4.52
Log in as Admin, but as the owner of the files. (I noticed that the HOST (!!) can not move the files of a lower user. another bug??)
go to the Admin menu File Manager
Directory 'A' contains 7 files. These 7 files are already uploaded on the server, or they would not show in the directory listing. :)
Directory 'B' is a new directory, standard, or secure, and is empty.
I check off 4 files. I click Move. (see step 1)
I answer OK to the dialog.
I then select where they should go. (see step 2)
After clicking any confirm to finalize, I check the destination folder and see that only ONE file moved. See step 3