I'm looking at the limits published on this article: https://help.zoho.com/portal/en/kb/zoho-learn/general-1/image-and-file-sizes/articles/file-upload-sizes#Knowledge_module. 

I want to clarify my understanding of the limits.

1) Example: if my course has 3 video lessons and I'm on the Professional plan, does that mean I can upload a maximum of 3 GB video files, maximum 1 GB video file size?

2) What is the use case where "Storage availability per plan" is used?