Not saving my work

Was it, by any chance, created in the old version and you are trying to view it in the new version?
In that case you need to "import" them in the new version.
If that's the case, see that video:
https://www.youtube.com/watch?v=iSPydLrDV34

If not, then we would need a bit more info, and a screenshot of the issue always helps! 🙂