Have you taken a look at this comment already? Solid Plume - simple blog app - #71 by A_A
Copying the files should work flawlessly.
If you mean to upload a different version of Plume (not 0.11) you can also use Solid Copy and solid-local-pod-manager to copy it from your file system to your pod.
I’d advise not to use solid-filemanager’s unzipping (I think I called it “Extract here”), as it is a bit broken with the content-type.