Xodo is a free website/app that allows you to write on PDF files. You can then save the file to your hard drive or a cloud drive so that it is available to submit. Xodo will work on Iphones, Ipads, Android devices, computers and in a browser.
When we get ready to use Xodo in the classroom I will walk students through this process. If you would like to find out more about Xodo, visit their site here.
(You do not have to create an account but, if you do, your pdfs will automatically sync.)