I've just started using Bandlab to make recordings with other people. It's web-based and free. It's really a basic DAW that allows different users to work on the same song by adding new tracks and effects, etc. You can use the site for recording or transfer files from your own recording set up. It requires wither Chrome or Microsoft edge as a browser.
It avoids the awkwardness of sending files of single tracks to your collaborator and converting them if need be.
The only real snag I've found is that it can take a long time to save projects. I've only done a couple of projects so there may be other problems that I just haven't discovered yet. You also get some interesting loops covering a range of styles.