Build CODE for Android

Hello! I tried to compile Android on CollaboraOnline and the ARMv7 for LibreOffice was successfully compiled and working properly. CollaboraOnline android build the prompt JS, HTML and CSS has had been updated (android/lib/SRC/main/assets/dist).

However, in fact, my android/lib/ SRC /main directory does not generate assets directory, may I ask what causes it?
NDK version: 20.1.5948944 (same as the cross-compiled version of LibreOffice)
Configuration information for the CollaboraOnline Android compilation:

./configure  --enable-androidapp \
--with-lo-builddir=/LibreOffice/core-armv7 \
 --with-poco-includes=/opt/poco-android/include \
--with-poco-libs=/opt/poco-android/lib \
CC=/home/goalgo/Android/Sdk/ndk/20.1.5948944/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi21-clang \
CXX=/home/goalgo/Android/Sdk/ndk/20.1.5948944/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi21-clang++ \
--host=arm-linux-androideabi  \
--disable-setcap    --enable-silent-rules  --enable-debug   

I have solved the problems associated with building Android,
In addition to compiling from this article:Build for Android | Collabora Online - Community Page
We need to know that we should build on the 6.4 branch,
The branches that you need are:
core: distro/collabora/cp-6.4
online: distro/collabora/co-6-4