It mentions in the release notes that projects get issues with external applications/services editing project files as these external applications can keep files locked and it can lead to corrupt files, or the IDE unable to commit any saves, etc. The worst problem was that code from one object would end up in another project because there was an object in both projects with the same name, and the original project had been unable to save and close the code file because the external application had it locked, and it got carried over to the next project.
You can upload your project files to a cloud folder afterwards, but it has never been a good idea to do your project work using a cloud folder as it can cause these file locks and corruption issues.