The following issues have now been fixed in v3.4.7:
- Creating new files / folders
- Deleting local files / folders (causing a failed remote action)
We've also made some new additions when looking into the above
- Renaming remote files / folders
- Allowing local files to be edited
- Allowing local files / folders to be renamed
We'll shortly update our release notes for v3.4.7 on our website.
We're still currently looking into the download / upload speed, we can likely improve this by implementing compression (however not all FTP servers support this).