I think this is related to : Attachment issues after upgrade from 10.11 to 11.0 - #29 by ThomasFa
and it wasn’t clear to me whether I should have renamed /storage to /store/file or this was something that the migration process was supposed to do.
I see this in the logs:
2020-09-16 11:29:23,770 [XWiki initialization] INFO .HibernateDataMigrationManager - Storage schema updates and data migrations are enabled
2020-09-16 11:29:24,028 [XWiki initialization] INFO .HibernateDataMigrationManager - No data migration to apply for wiki [xwiki] currently in version [1138000]
should I bump it to some early version so it could re launch the migration?