With Input you can open and read your QGIS projects directly on
your mobile or tablet device. The data and projects will be
synchronised when user is connected to internet. For a quick start
you can follow this tutorial:
https://www.lutraconsulting.co.uk/blog/2020/02/14/survey-qgis-input/
https://www.lutraconsulting.co.uk/blog/2020/02/14/survey-qgis-input/