I have a similar issue of the “cross-devices mount” detailed here: Error while listing on creation or resync of a DataSource
I succeed to get past it but was block on the next step, that is building the index (the storage exist, the workspace as well, but I cannot list anything inside for some obscure reason.)
I’m waiting for support as well, it seems pretty basic use case so I hope we’ll find a solution (it was working as is in pydio server from version 5 to 8).
wait&see