How to send or read an excel file from a network drive if it is not connected?

Question

.NET

Hello everyone, I don’t know how to approach the task,
there is a network drive, it’s connected on some computers, on some it’s not, so you need to send the excel file generated programmatically to a network drive to a specific folder,
there is something about ftp -server and about the smb protocol, as a solution, but is it generally,
all computers are inside the local network,
will you need to raise the server in any case to transfer the file? Or am I misunderstanding the essence of these decisions in general? Point to a deeper thought with useful links, thank you all :)