Filename order lost when adding 2 or more directories

Hi, When adding 2 or more directories, the filename order goes out of sequence. I can fix this doing one at a time, but very time consuming. Any help welcome
Thanks, Wayne

Added files appear at the bottom of the list of already loaded files.
You can sort the files (again) by clicking on that column header that shows the data by which you want to sort.

Also, you can devise special sort criteria (for each column) in the column definition in the option "sort by".