Can't upload files

About 10 minutes ago, smartFTP stopped bahaving properly when I dragged files from my local browser to my remote one.

Instead of copying the files over, it now creates an icon in the desired folder of file size 0 and adds the copy request to the transfer queue. It tries again and again to transfer the file but nothing happens.

Meanwhile my internet connection works just fine otherwise and I'm able to edit and save remote files just fine.

How do I fix this?

Ah. It was a file ownership issue. Solved.