I can confirm the kobo Nia has an internal SD card : r/kobo
How to Expand Internal Storage of Kobo eBook Readers (Video)
2PCS Tempered Glass Screen Protector For Kobo Libra H2O Kobo Libra 2 7.0 Inch Clara 2E Kobo Nia Glo HD 6'' Protective Film - AliExpress
How to Load an SD Card on the Kobo H2O
Question about what e-reader allows you to import ebooks from sites like z-library : r/ereader
Kobo Aura - eBook Reader - 4 GB - 6(N236-KU-BK-K-EP)
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Suitable for Kobo Clara HD 6-inch tablet leather case e-book Custer smart sleep Kobo Nia protective case - AliExpress