I’ve identified the cause for confusion regarding the exercise storage usage when no exercises have been created.
Re-mixing educational resources from publicly available channels on Kolibri Studio generally does not count towards your storage usage. It’s our intention to support freely re-mixing these resources. Also, in a technical sense, importing content doesn’t duplicate related file resources so, again, there’s no effect on storage usage. Although, exercises are currently an exception. During publishing of a channel, a ZIP file is generated for each exercise it contains. Since this file is often small, re-mixing exercises has a negligible effect on storage usage in most cases. Exercises may also have images embedded in its questions and/or answers, which also get added to the generated exercise ZIP file and would increase its file size.
By re-mixing and importing enough exercises from other channels, it’s very much possible to incur storage usage that grows over the initial 500MB of storage after the destination channel is published. By following these instructions, you can request more storage. An alternative is to import the exercise resources directly into Kolibri.
Thank you for your interest in using Kolibri Studio and using it to re-mix publicly available content. Kolibri Studio is an open-source platform, and we value this user feedback, and any contributions, in helping to improve Studio. We’ll be working to rectify this issue, but due to limited resources, there is only so much time we can put into supporting our free service.