iOS Creating a simple iOS Extension (GenericTest) doesn't work

[sman]

With GMS2 2.1.5, I follow the iOS and Android: Creating A Simple Extension tutorial.

- I create a new extension named "GenericTest"
- I click on iOS in "Extra Platforms"
- In "Class Name" I put "GenericTest"
- I click on "Add Source" and select a directory where are GenericTest.h and GenericTest.mm
- In the window "Extension: GenericTest" I click on the icon next to "Files" -> Add Placeholder -> Add Generic Placeholder
- I double click on GenericTest.ext, click on the icon next to "Functions:" -> Add Function
- Name: AddTwoNumbers, External Name: AddTwoNumbers, Return Type: double, argument0: double, argument1: double
- In my gml code, I write "var test_addition = AddTwoNumbers(2,2);"
- I launch and test_addition get the value 0 and in the log I read "Unable to find extension class for GenericTest"

What did I do wrong?

 

[blovestorm]

put the file in the root directory

 

[sman]

put the file in the root directory

Which file in which directory?

 

[sman]

As I believe I did everything explained in the tutorial, I filed a bug report, but YoYo answered me: "We don't offer general coding/gamedev support on this bug-reporting service".
They could at least verify that we still can create iOS extensions before saying I just ask for coding help! They are sure it's not a bug, without testing

 

[sman]

Oh! I discovered something very mysterious!!
When I change the class name (in GMS2 and in the .h and .mm files) from "GenericTest" to the class name of an extension that is working in another project, it works!!!
And any other name doesn't work...

 

[quinndexter]

I'm having trouble with it for Android, getting this error in logcat:

Extension Class not found: com.company.game. attempting to call ReturnAsync

Same for the other three demo functions.