02755 for directories, 755 for files. If this is confusing, or not an option in the FileZilla UI, I would advise you to forget about this unless you have some problem in the app.
The directories bits are probably already set correctly.
If this had a problem, you would be seeing undefineds due to the cache directory. You can also check if you can upload a file in Notes or Documents modules, and then retrieve it correctly. If you can, then the upload directory is ok too.