The microscope needs a seperate camera app on your phone to work as your inbuilt camera app won’t detect the microscope.
https://play.google.com/store/apps/details?id=com.zyepro.mobilescopes is the app I recommend.
Install app
Plug in microscope and it “should” automatically give you the option to open the app.
You also need to ensure your phone is OTG compatible.
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