It was so obvious that I didn’t see it ! 
And please believe me, I spent some time looking !
Thanks a lot for your help.
Surprisingly, it used to send back the whole list of organizations without those parameters in the previous version… That’s why I thought there was a problem. 
Hi @a1ex4
You can find the documentation here: https://download.seafile.com/published/seafile-manual/deploy_pro/multiple_storage_backends.md
But for migrating from one FS to another FS, there is one bug in the current version that needs to be fixed in 7.0.5.
Personally I really hope to keep the ‘video thumbnail’ feature, or at least add it in the roadmap.
Considering lots of people using docker to deploy Seafile, adding some extra libraries probably won’t be causing issues?
The CPU and memory usage is definitely a problem, but probably not unresolvable.
Anyway, really hope to have the feature again in future, it makes the web UI much more usable for people with a lot video clips.
Thanks