I can confirm the kobo Nia has an internal SD card : r/kobo

Kobo Nia Review

Kobo Clara 2E eReader review

Kobo Nia Review

These are the most travel-friendly e-readers - Good e-Reader

What's the best eReader to buy?

The Kobo Nia is the first e-reader that the company has released in 2020. It is considered an entry level e-reader that is ideal for people who have

Kobo Nia e-reader Review

Kobo Libra 2 review: still the best ereader option around

How to Load an SD Card on the Kobo H2O

Kobo Nia Review : Is it the Best Budget E Reader? BorednBookless