Java Minecraft Structure Block transfer to a paid server my friend has

i have my Structure Block all ready to go and found the file (took awhile ) and now im trying to figure out how to get the file into a hosted sever my friend has

You should put it in a corresponding folder in the world save folder of the server. Normally, the server's subfolder world corresponds to the folder with world name in .minecraft/saves although the folder name can be changed in server properties

For example, my experimental world is called 1_15_redstone, and the structure I saved was called inot. So, I take the file:

.minecraft\saves\1_15_redstone\generated\minecraft\structures\inot.nbt

and upload it to the server, placing it in the server's subdirectory

world\generated\minecraft\structures\inot.nbt

It's entirely possible the subfolder generated and its subfolders won't exist on the server - they are only created as a first structure block's structure is saved, so either create them, or just create and save any dummy structure in game on the server.