Problem of Dataset formatting and Croissant metadata

Hi I am uploading my first dataset to HF and I am running into an issue: the “Use this dataset” button does not appear. I am particularly interested in the generated Croissant file. Right now, I can manually type the API endpoint, but I get a quite empty Croissant file with no record set. My dataset is a bit unusual as it a graph dataset with hundreds of graphs (each associated to two CSV files). Thus I wonder whether the problem may come from data formatting expectations that I ignore. Maybe, it is just a matter of time [I uploaded the dataset a few hours ago]? I am completely new to HF data processing pipeline, so any help would be welcome! BTW, here is the dataset: https://huggingface.co/datasets/MarcDamie/Fedivertex-Reduced/tree/main