Hey I just wanted to add that I’m experiencing a similar skein issue with my project, every time I try to check in changes. I end up deleting the .skein file and taking a new snapshot every time I want to save my project with source control, because it’s impossible for me to check in changes.
Here’s my forum post about it. Minor: Skein - Can't check in changes. "Operation 'copy' not supported by source control provider 'Skein'" and "uasset does not exist"