@陆thanks for your help! I tried uploading the STL files and it just keeps saying fail and won’t upload to the Polo print app… now what do I try?

I found an articulated dragon I would like to print. I had to download files to my iPad but now I don’t know how to get the files on to the ENTINA Tina 2s to print… does anyone know how to upload files to the Poloprint app to print on Tina 2s?