Hello aspirant, yes , there is some protocol you need to follow when uploading documents for the NEET  UG 2020, NEET(National Eligibility cum entrance test) is conducted by NTA(National Testing Agency). You can refer https://medicine.careers360.com/articles/neet-2020-photo-size-format-documents for exact specifications of uploading documents like photo, thumb impression and other details.

Hope this helps.