The drop-down menu, when selecting a community to post to, tends to be unreliable; the community I want to post to won’t always appear.
I wish the community drop-down menu was a text-area instead; then I can type in the community to post to if the drop-down menu can’t display the community.
It seems the search field searches for more than just the community name, e.g. when I search for Test it finds a lot of names but it also finds the community “Test”. It is probably easier to bookmark or subscribe a community when you post to it repeatedly (or remember the URL to type it)