425 Permission Denied. No Write Permission.

425 Permission Denied. No Write Permission.
This is the message I get when I try to upload a file.
What could this possibly mean.
I can download files off of my server just fine. I cannot upload anything though. I checked permissions in Windows explorer for the particular folders I am using but it still won't let me upload to those folders
Thanks in advance

Talk to the system administrator of the server. The user you are trying log in does not own the directory you are attempting to upload to [and therefore, does not have write permissions), but the user does have read permissions to it.

It is my machine and I'm not connected to a server. How do I give permission to upload?

Is the server and the machine you are using to connect to the server the same workstation?

What server are you using and what OS are you running it on?