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Modifying an STL in OneShape

Hello,

I am new to CAD software and I am following a YouTube tutorial for 3d printing. 
>I have imported the STL in a part studio
>Created a 3 points plane matching one of my model's faces 
>Created a fully constrained rectangle on set plane 
>Trying to Extrude -> Add -> Blind the rectangle through the STL model (I am trying to remove writing from one of the STL's faces)
>Getting "boolean operation failed to return a valid part"
 
What am I missing here? I know that OneShape has only limited support for STL but I am sure what I am trying to do should work. 

Answers

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