This video explains how to make a PDF writable on an iPad. Another way of doing that using an iPad can be viewed here, from a student perspective. If students are using a laptop, they can try this method to write on or edit a PDF.
Check out the quickstart, right, if you need to add your signature to a PDF.
This video explains how to download and access Google Drive File Stream so that you can be sure your files will still be accessible to you once you receive your new laptop.