You cannot stop a specific upload.
However, you can limit the number of simultaneous uploads by going to the transfer options (transfer tab/modify transfer behaviour).
You can even change the number of uploads to 0 to stop all of your uploads.
You cannot stop a specific upload.
However, you can limit the number of simultaneous uploads by going to the transfer options (transfer tab/modify transfer behaviour).
You can even change the number of uploads to 0 to stop all of your uploads.