Binding RAT (spymax) payload to APK

FSBOT

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Hi all,
Does anybody know how to bind a RAT payload such as spymax's to an APK?

When I check the bind checkbox I am asked to choose a file, so I choose the APK I want to bind the payload to. Then I am asked to choose an apk, so I choose the same apk.
However, Spymax is stuck at "Copying Original Files"... What am I doing wrong?

Sorry if this is not the best way to ask... I'm new here
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