Beta versions are not as thoroughly tested as stable
Hotfix for r278
Don't miss out on the latest and greatest new features in Construct 3
This update fixes an accidental regression in r278 that broke saving projects to folders.
In case you missed it, see yesterday's r278 release notes here.
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I tried opening the preview on a project with 3d objects on this beta version and an error popped up and failed to open, but when trying to open a project without any 3d Objects on it, It works normally.