Over the summer we added a new feature where you can attach PDFs to problems. Linked PDFs will automatically embed in an iframe. If your lab assignments are already in PDF format you can just attach them to your problems and ClassCube will automatically embed.
We just made it even better.
Now, if the only text in the problem instructions is a link to a PDF ClassCube will now make the PDF fill the instructions panel.
The editor is on the left side. On the right is the attached PDF, now taking up the full panel.