File already existing in External Editor, or is being uploaded

WinSCP Version 5.5.3 (Build 4214)

I upload (drag&drop) my file through WinSCP onto a cluster. I open the file and edit the file. I close out of the file. I try to open it again, and the error pops up:

The file 'such_and_such' is already opened in external editor (application) or is being uploaded.

Nothing else is open on my computer..[/img]

Did you check that the transfer queue is really empty?
https://winscp.net/eng/docs/ui_queue

You're right! They actually all show up in the transfer queue... Why does this happen? How do I make it so that any files that get updated, saved, or altered, get automatically changed without going into the queue with the Waiting.. Progress I would have to force it to start every time.

Maybe you disabled queue processing? See Commands > Queue > Process Queue.
See https://winscp.net/eng/docs/ui_queue