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Each user gets their own partition in storage. So that user can see the SD card, just their partition in the card (whether internal or external).
Same with the primary user - it can only see its own partition.
If you have root, you can see these partitions as "user00", "user11", etc. From each user's perspective, the related partition is mounted as SDCard or SDCardExt (or something like that, depends on the phone).
You can't remote into Android without a third party app, since Android doesn't natively host any remotely-accessable service (side note: this is part of what makes Linux more secure natively than Windows, and why we saw viruses on Windows - it natively has sharing services such as everything based on LanManager).
If you want to have access to the file system over the network, you'd need to host a network file service, i.e. FTP, Samba/CIFS, etc, from within the user profile of the partition you'd like to access.
If you want remote control, you'd need to use something like Rustdesk or ScrCpy.
I enable file sharing between user partitions by installing SyncThing-Fork in both profiles, then creating a sync job in both user profiles. For example, Profile1 has a local folder called SyncToWorkProfile, that Syncthing uses with a sync job ("Folder" in Syncthing terminology), that's shared with the Syncthing Device ID of SyncThing in the Work Profile (and I do the same in the Work Profile). Those file system folders are unique to each partition - they're different folders, as different as folders on 2 different computers. SyncThing simply synchronizes files between devices - since it sees each installation of SyncThing as a separate device, those two folders are kept in sync.
It would probably be more useful if you describe what you're trying to accomplish - then we can consider the different ways to achieve your goals.
The first user (owner) is probably 0, and the second one be 10, and additional users after 10 would be 10+x (11, 12, 13…).