Thank you for the reply. I had to park this.
I checked, it's a cryptpad.fr account and no other shared folder, no files from other instances.
The account contains a 12 Mb shared folder of someone else only. 1.22 GB used of 1 GB.
Opening a new document prompts the limit reached, not saved in your cryptdrive message.
Is this a bug or a feature to get you to upgrade?