I've scoured the web for answers to this and have yet to find a solution. I have added a few words to the personal dictionary in Gboard settings and they aren't working. Trying to create shortcuts for things like my email address, but when I type the shortcut into Gboard, nothing happens.
I've tried uninstalling and reinstalling Gboard. I'm currently using a Samsung Galaxy S5 and it's on Android 6.0.1, all software is up-to-date. I emptied the Gboard cache. Nothing helps.
Has anyone else had this problem? If so, what did you do to fix it? Thanks. It's been driving me nuts. I am upgrading my phone this week to a Galaxy S8 and maybe that will do the trick.