I run XMarks across multiple Firefox installation, and on a number of Android phones and pads. Mostly trouble free. Just occasionally on the Androids I need to force a new sync, or even clear the local cache. On most of the devices - mainly a Nexus Pad and A Galaxy S8+ Phone - a tap on the screen gives a little " ... " dots icon, bottom right. Hitting that brings up some technical options / settings.
BUT, on a new XMarks installation on a Galaxy A3 (2017) I can't figure out how to get the " ... " dots icon to appear at all. And so I can't force a fresh sync operation. My downloaded bookmarks from the first installation are all there, but they are not up to date.
Any ideas? It has me baffled.