##  Class files

Sometimes, there can be problems with the built in PDF viewer, which may cause images to not appear. If everything is correct in the code, the images should still appear in the downloaded PDF file. To resolve this issue, you can simply change the PDF viewer from built in to native using the instructions found here. If the images are still not appearing, there is likely something wrong in your LaTeX. Make sure that you have uploaded the file and specified the file location correctly.