Using DocHub with PDF files in Google

I have been using DocHub with PDF files with my students for almost a month. We have decided this is the way to go. There is no fee or upgrade account. Students can write, draw or highlight on PDFs. They then export to Google drive if using Google Classroom. There are other save options if not using Google Drive. The only draw back we found is files are not in a Classroom folder. Students need to go in and put it in their folder. Teaching students how to organize their Google Drive is important or they have trouble finding files.