Welcome to forums.
If I understand correctly, you want d&d to transfer automatically. It can!
there are two settings, one to control the d&d within ffxp the other from Windows to ffxp and vice versa.
Press
F6>actions>
Drag and drop and select transfer.
You can ensure that
drag and drop with explorer is also set to transfer.
Click
apply
Im not sure if changes are automatic or if you need to restart ffxp either way it should do what you want.