I’m considering purchasing a DTF UV (A4). How should I prepare the file if I need to create white logos? To print in white, should I assign a particular colour to the document? A spot colour?

The file mustn't have a background, when you send it to us, please specify that the design contains some elements that are white. Naturally, the file must be in its actual print size (1:1) at 300dpi. Preferably vectorial.