In addition, "copious amounts of" is very formal, to the point of sounding pompous or humorous in everyday speech, but may sometimes be used for emphasis:We use amount of with uncountable nouns. Number of is used with countable nouns:
We use a huge amount of paper in the office every day.
The amount of time it took to finish the job was very frustrating.
Amount of, number of or quantity of ? - English Grammar Today - Cambridge Dictionary