Hi @Tony Söderberg ,
As far as I know this feature is still existed in Office 365, this is related to how did you share the file and the permission of the shared folder.
- Check the permission for users, make sure all users have access, read, write and delete permissions.
- Create a new folder and a new file, test with full permission users and check the result.
You can also provide the steps for sharing here, I'm glad to help you.
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