I don't use Moodle, but it looks like there is a selective import with Canvas. That means that you could upload the file multiple times (hopefully you have a fast internet connection, it would take me 1.5 hours to upload the 802 MB file and I think that might trigger the file upload timed out message). The first time, try just importing the quizzes.
In this lesson from the Canvas Instructor Guide, when you get to "Select Migration Content" portion (maybe 60% of the way through the page), it mentions "Select specific content." How do I import content from Moodle into Canvas?
The lesson that explains how to select specific content is How do I select specific content as part of a course import?
I will say that information I found online about Moodle backups is that it can contain user information. That will not get imported into Canvas. Also, Moodle Lessons are not supported (per the Canvas documentation). I don't think that's causing the lockup.
Another thing you can do is to test your .zip or .mbz file from Moodle and make sure that it's valid. How to do that depends on what operating system you're using and what software you have installed, but if you aren't sure and could just extract it somewhere, that would verify the file isn't corrupt. Unfortunately, you cannot just remove files from it to cut back on the size and rezip it and have it work.
I don't use Moodle so I don't know if this is the issue, but maybe there is something you used in the second course that you didn't use in the first course that is causing problems. What you might try doing is exporting the content from Moodle and make sure it's an IMSCC (IMS Common Cartridge 1.1) file. Then, when you go to import the file inside Canvas, you may follow this lesson from the guide: How do I import content from Common Cartridge into Canvas?
Some difference in the file seems like a more reasonable explanation given the 5.2 GB limit and the smaller size on the second course.
What version of Moodle are you using? Canvas supports Moodle 1.9 or 2.x, but I see that Moodle has been with version 3.x since 2015.
I also don't know when you made the Moodle exports. If the first one was older (from version 2.x) and the second one was newer (version 3.x), then that might explain the problem as well. In that case, the IMSCC route would be the way to go.
If you are using version 2.x of Moodle, this page (buried in a link Chris provided earlier) Content Migration from Moodle to Canvas - Help Wiki says that when you do the backup (it explains how), make sure that the only three settings are to include activities, blocks, and filters. Another handout on exporting Moodle into Canvas says that you need to uncheck the include user role assignments, but leaves other things enabled.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.