Thank you for reporting this. For us this is a bit hard to test as we do not usually have large csv files to test the import process as it should. This issue may be related to the cronjob of Akeneo, which is not configured by default.
I have created an internal task to add the cronjob and we will try to add it for the next version of this stack.
Furthermore, could you please try to use the cli tool of Akeneo to import the csv? Just to check if that works:
Note: before using the cli tool you should load the environment of Akeneo executing:
And give execution permissions to the console:
chmod +x /opt/bitnami/apps/akeneo/htdocs/bin/console
Then, you will be able to execute it.
By default the console has a limit of 800M of memory, if you want to increase it, you can check this guide: