Uploading a folder (and its subfolder) is not as easy as uploading one or many files.
You can upload many files in one shot, but not a folder.
To upload a folder, I suggest you to zip it, then drag’drop it in Finder, then extract the zip file, that works fine.
About deletion, I have noticed there is a problem sometimes to delete files, be sure I’ll correct that quickly.
Sorry for these, I spent all my time on the pro version (the only way to make a bit money, work is not free you know that), that free version is only supposed to introduce the pro version, that’s why it may not be perfect. Is looks like 15€ (price of pro version) is too expensive for most of people; however 15€ is the price of 30mn no more of works for an IT developper, but can only a man develop that plugin or same functionnalities in 30mn ? That is the question..;)
Anyway keep an eye on updates, I’ll correct deltetion problem.
Thanks for feedback.