wimlib

I want to add some files to wim without extracting all of them.
wimlib-imagex append always creates index 2. Is there any way to add files to index 1? --rebuild option didn't work either.
It is okay that modify an existing wim, or also create a new wim by adding a few files to the source wim.

hello.

We ran into the problem of having to apply the xattr of NTFS while mounted as ntfs-3g .
Accordingly, we will develop a function to set xattr according to the driver in wimlib.
If this can be useful to someone else, I'd like to contribute to the mainstream.
Is there a manual on how to ...