I'm currently uploading files with a filefield and using the following code (more or less):

public function addFile($data, $form)
		{
			$file = new ProjectFile();
			$folder = $this->ProjectPage()->URLSegment;
			$file->loadUploaded($_FILES['File'], $folder);
			$file->OwnerID = $this->Member()->ID;
			$file->write();
			
			Director::redirectBack();
			return;
		}

In this way I'm able to create a folder depending on a project name if it doesnt exist yet.
However, this sets the folder name and 'filename' of it, but it doesnt set the folder 'Title', as used in the lefthand site of the cms in files section. That just stays 'new folder'.

Is there a way to set this as well, without having to hack it?

Solved by adding

$item->Title = $part;

to the findOrMake() method in Folder.php around line 32.

Not sure if this is a bug or a feature, but let's hope what I did doesn't break anything :)