How to upload a pdf document in csv upload

I have a list of documents which needs to be created with the data item when I upload csv. For example, Column A - Bill name and Column B - Bill (This cell has gdrive link for a pdf). When I upload this csv in bubble the item is created and file can be viewed. But when I change the gdrive link to restricted, I can’t view the file here in bubble. I need it to be saved in the bubble db when it get uploaded. How to do it?