Sometimes when I go out I want to sync recently added paper to my android tablet in order to read while commuting.
To do this, I open paperpile on the tablet, then I have found that swiping down seems to invoke a “sync”, though that might be a superstition.
In any case, it takes a variable amount of time before the recently added papers (via the web page) sync to the tablet. Sometimes it is immediate, but in the worst case it may be up to 5 minutes or so.
It would be nice if there were a button to force the sync, so that one does not need to wait around for it to happen.
This is only a minor annoyance. I usually remember to plan ahead and leave extra time for the sync now.