My setup works as expected in my python files, but not in tex. The snipppets themselves show up in insert mode, but not only does the mapping I use not work, but if I manually go
<c-r> =UltiSnips#ExpandSnippet() <cr> still nothing happens (this also worked in the python file). I see no visible output by the command, just nothing happens.
I'm not really sure what could have gone wrong and how I could even go around debugging this.
edit original question said vimtex, but disabling vimtex had no effect, so I removed that