Or you could just use Onshape. There's a free plan. It runs in the cloud in a browser on desktop so it's on MacOS, Windows, Linux, and there are mobile apps for iOS, iPadOS, and Android. The versioning system is very much based on concepts from GIT, and it will let you merge changes if you want. They recently added workspace locking so that it can be even more like GitFLow (i.e. branch to do work, merge changes into main when you're happy) and the version graph shows merging more clearly than it used to.