Upaniṣads like Maha Upaniṣad [linked with Samaveda], Narayana Upaniṣad [linked with Krishna Yajurveda] and Tejobindu Upaniṣad [linked with Yajurveda] all are minor Upaniṣads.
So are they (minor Upaniṣad) Shruti or Smriti?
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All the 108 upanishads contained in the list of Muktika upanishad are considered to be shruti. The complete text of muktika upanishad is here and the translation is here. All the three above upanishads are listed there as numbers 61, 18, 37.
SrI VidyAraNya svAmI cites Muktika Upanishad (MuktikopaniSat) in PanchdaSI 4.68 and thus says all the upanishads cited therein must be shruti.