You’re right, that’s not quite well done.
Concerning the “Save as…” action, the file appears in the “Content” view, but at the end of the list. So, I will change this and sort it to the correct position.
Concerning the “Projects” tab, I think it would be better to allow project folders being drag’n’dropped into the list directly. An external file explorer won’t be needed anymore.
Other (better) proposals?