Documentation for developers

posts: 1 Russian Federation

Why there is no documentation for developers?
To add functionality I have to trace the code.
Where is the documentation for the functions and api kernels?
The forum is simply terrible, the themes were created many years ago. The official documentation froze 5 years ago.
The project is very closed from improvements from outside.
I really need documentation on the functions of adding attachments on the page.

posts: 753 United States
Hmmm, seems like a legit question, yet no answer.

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