Glad you like the app and thanks for your support!
Unfortunately, my app does not support syncing user defined bookmarks, tags or collections across devices at this time.
I have a task on my todo list to support syncing of user defined bookmarks and tags across devices. Since you've now requested the same for collections, I've added that as well to that task. I'll look into it and implement it, if possible, in a future release.
Thanks!!!
Now that's what I call service!