PC version is fully supported. Android/Quest has partial support. Android users are able to see the drawings when they join, but if an android user is an instance master (the owner of the most complete image), then nobody will be able to sync

First picture: @zexpha.bsky.social

It also means that you won't lose your drawing if you crash or disconnect! As long as there is at least one other person left in the instance, you will be able to rejoin and continue

First picture: @paaalulu.bsky.social

VRChat world "2000s Classroom" just received LATE JOINER SYNC support! This means that if something is drawn on the chalkboard, anyone who join the instance will see the drawings instead of an empty board!