I am using a document-library component (on SP online) : currently 7.4 GB are used. I want to copy a folder (4.71 GB) but I have an error message whitch says me that there is not enough free space on the disk (sharepoint disk). Where can I change that ?
Your Site Collection may have a quota, probably 10GB. Contact your Office 365 Tenant Admin and find out if you have a quota on your Site Collection, and if they will increase it for you.