Cannot export to Songbook

Hello,

This bug is happening with the MuseScore app for Android. I apologize, because I am pretty sure this is not the right section for it since the website is "musescore.org" and not ".com", but I am unable to access the right community discussion on ".com". The link "https://musescore.com/groups/musescore-android" brings me to a "page not found (404)".

So here is the issue:
In the Musescore app for Android, when I try to add a .mscz file to "songbook", it just says "loading, it may take a while" forever without finishing the process (I waited more than 30minutes).