Button with hexagon shape not recognizing mouse click

'Saving Images in BMP (Windows Bitmap) Format' tutorials were cited in a stackexchange.com post in 2021.

The Saving Images in BMP (Windows Bitmap) Format tutorial was cited in a stackexchange.com post in 2021.

Subject: Button with hexagon shape not recognizing mouse click
Date:  2021-02-24
Source: https://gamedev.stackexchange.com/questions/189398
  /button-with-hexagon-shape-not-recognizing-mouse-click

I made a hexagonal button, with a png image, the problem is that if i click
outside of the image of the hexagon(but still inside of the squared area that
defines the whole button), the click is registered , if i click inside of the
button nothing happens, now i just read in the docs about the property Click
Mask, so i made the same image of the hexagon shape into a bitmap, but this
error text comes up:

The selected resource (StreamTexture) does not match any type expected for 
this property (BitMap).

I used this linkt as a guide to create the bitmap, 
https://www.herongyang.com/Windows/GIMP-JPEG-Save-Image-in-BMP-Format.html, 
still i don't know what i'm missing. Also used MS Paint to save it as 
bitmap, but that din't work either.

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