Working with several numbered Gui shows unusual behavior for Gui with number 1.
Using name or number before GuiDropFiles like 2GuiDropFiles for Gui with number 2, 3GuiDropFiles for Gui with number 3 and so on seems to be standard.
But 1GuiDropFiles for Gui with number 1 is not working. Instead using GuiDropFiles for Gui with number 1 is doing the job.
Wouldn't it be more consistent when even a Gui numbered with 1 could use 1GuiDropFiles too, instead of only GuiDropFiles?
This could avoid some misunderstandings. I've lost much time by understanding and testing this unusual agreement.
Script for testing