There is a huge difference in meaning between “indigenous”, “aboriginal” and “Aboriginal”, do your learning/research…indigenous is all inclusive of all and anyone born in a country. Aboriginal with a capital A, is a unique identifier in the English speaking language, to those aboriginal peoples , specific and only to Australia. In this usage, Aboriginal with a capital A is a noun, not an adjective, whereas aboriginal people, is aboriginal descriptive of a particular grouping within a country of indigenous People born to/in a country.

Understand what you’re saying/meaning if and when using English, especially in reference to Australia.