Addendum (8/29): Some students point out problems with uploading PDFs to Canvas discussions. For this reason, please upload other image formats (PNG, JPG, …). You can use screen capture to extract an image from a PDF if necessary. Other students put PDFs in other places (Box, Canvas file uploads) and gave links. This is acceptable, but not as convenient.
We have given people a little more time to upload sketches.
If you have linked to a PDF, we would appreciate if you also uploaded images (or replaced the PDF links with actual images).