I just downloaded some single cell multiomics original sequencing data (.fastq.gz) from human cell atlas (HCA) from here. There are both single omics data and single cell multiomics data, and I identified which files are single cell multiomics files using the label from this website. However, I only got four fastq.gz files for an experiment (files with the same ID).

Pla_HDBR10084192_S1_L001_I1_001.fastq.gz
Pla_HDBR10084192_S1_L001_I2_001.fastq.gz
Pla_HDBR10084192_S1_L001_R1_001.fastq.gz
Pla_HDBR10084192_S1_L001_R2_001.fastq.gz

I want to further process the sequencing files (fastq.gz files) of scMultiomics using cellranger arc, but the filenames and file counts are confused. I know that just for one single cell RNA-seq experiment, there would be three files: R1, R2 and I1 fastq.gz file, so does it mean the remaining I2 file is the only file for scATAC-seq?

Or does it mean that there are other folders containing the files also for this experiment, and I should put all these related folders together to feed for cellranger arc?

Or I got the wrong labels, and these files are actually not scMultiome data but just scRNA-seq data (single omics).

May I have your comments and suggestions? Thank you very much!