When attaching a location to a post (Mobile web and possibly Android,  iOS and desktop web) I'd like to be able to type in a location as well as choosing from a list. That way I can attach the post to a location different to where I currently am. So for instance, I could post about a demonstration tonight in London and attach it to the location of the demonstration.

There is a way of doing this backwards by going to the location in Maps and sharing the location, but then I can't add other attachments. The location is the secondary attachment, not the primary one.