Debug Canvas LMS errors
Locate log files
The Canvas LMS logs are stored at installdir/apps/canvaslms/htdocs/log/production.log and installdir/apps/canvaslms/htdocs/log/delayed_job.log.
Troubleshoot upload/attachment errors in courses
If you are running Canvas LMS in a Unix system and you experience errors while trying to upload or attach a file or an image to a course, it may be due to the sticky bit in the /tmp folder. Canvas LMS performs a couple of operations in the folder /tmp while uploading a file or an image, and it requires the sticky bit to be set on that folder. To enable it you can execute the following command:
$ sudo chmod +t /tmp