Why is the File Upload field limited to 5?

Why is the File Upload field limited to 5?

I am trying to set something up where my customers can upload the files required for onboarding them via Zoho Forms, but I discover that I am limited to 5 fields.

Our customers need to upload around 10 different documents, each of which I would like to be able to see in their record in the CRM.

Any ideas?