Also 1 more question, can we have more than one storage options , a secondary storage maybe. if yes which changes need to be performed.

here I mean

No, I wanted to have my data (in folders) to be visible in the dataset tab. So If I manually add a dataset (many excels), in a folder, and copy that folder to NFC, will it automatically be available in dataset tab? or do I need to perform some action

Thanks for the answer! If I set a PVC is it possible that the data(datasets) present in it will automatically be visible in Datasets tab ?

for example: I copy a folder (which has data) from my local machine to file share, would it be visible automatically in the clearml data tab, or I need to upload the data using Dataset class