UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9202.18.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.32 Safari/537.36
Platform: 9202.18.0 (Official Build) beta-channel cyan

Steps to reproduce the problem:
1. Start an Android Filemanager 
2. Look for sdcard from ChromeOS (not /sdcard of android itself)

What is the expected behavior?
There should be a symlink like /externalSD or in /mnt or /storage

What went wrong?
Seems like /etc/init/arc-removable-media.conf tried to mount something:
localhost ~ # cat /var/log/arc-removable-media.log 
2017-02-16 19:49:55.673688905+01:00: Starting arc-removable-media
+ exec mount-passthrough-jailed.sh /media/removable /run/arc/media/removable /opt/google/containers/arc-removable-media/mountpoints/container-root 227

but it isn't available in unrooted android for apps. There is no /media, no /run, but /var/run/arc/media/removable which can't be read (uid 1023 gid 1023 permissions 551)

WebStore page: 

Did this work before? N/A 

Chrome version: 57.0.2987.32  Channel: beta
OS Version: 9202.18.0
Flash Version: 24.0.0.221