Enable versioning settings - Major and minor versions
For exisitng SharePoint users to migrate to Groups they need documents migrated from SharePoint libraries. Most of the libries are major and minor version enabled. In this case we cant migarte content due to O365 Groups doesnt have that setting.
Eric JENOUVRIER commented
File are store within a Document Library, so all the feature are already there, this is just a question of setup.
Once teh group is created, go on FILE, then use the VIEW panel of teh group to access the Document Setting Pannel, then go on SETTING, then tweak versionning from MAJOR VERSION (last 500) to MAJOR/MINOR and appropriate setting you need.
Michael Bunyan commented
moving stuff from other locations is needed togther with bells and whistles
Sudesh Withanage commented
We need same settings available in SharePoint libraries. This is due to end users have got used to all these rich features.