transferring folders first?

My request is pretty simple. Let's say I have this structure:

Folder_1
----Folder_2
--------file1.txt
--------file2.txt
----Folder_3
--------file3.txt
--------file4.txt
----abc1.txt
----abc2.txt

In the current way SmartFTP works, this is the way it would transfer "Folder_1":

First upload abc1.txt and abc2.txt,
then Folder_2 and its contents,
and finally Folder_3 and its contents.

My request is basically to make an option, to first transfer the folders (go as deeply as possible into directory structure) and their contents, and ONLY THEN go back to the main folder, and transfer the rest of the files. This would make the above folder structure to transfer like this:

1) Folder_2 and its contents
2) Folder_3 and its contents
3) abc1.txt and abc2.txt

Hope my request is understood
Thanks in advance.

doodle

And if for example a priority filter of file?.txt would exist then:

Folder_1
Folder_2
file1.txt
file2.txt
Folder_3
file3.txt
file4.txt
abc1.txt
abc2.txt

The most important rule would be to download prioritised files first, including even those from sub-folders. This would be in accordance with the meaning of 'priority'.