Sorry, I didn’t seen that but Appzard have merged that PR. You can make extensions which uses an AAR library in Appzard. BTW, the document scanner library you linked above uses Open CV library. Its size is 55 MB. Users would not be able to compile their apps because of building size limit. You should find a light weight library.
You see, we humans can do a lot of work. However, we need rest and we have always have a maximum amount of work that we could do. You can’t write 10 essays in 10 minutes…
Same with machines. The server is capable of a lot of things, but it has a limit. This is not because Appzard intentionally wants to do this, but rather the fact that the server is only capable of handling this amount.