Rescan files on manual upload to docker volume via host machine?

I run Nextcloud 11 inside a docker container and was wondering if it’s possible to use the same docker volume path for a transmission container too, so it will download files and they appear in the cloud.
I created a file in the cloud folder on the host machine (inside my username folder) via http user, but it wasn’t detected by the cloud. I guess maybe it’ll only appear after a file rescan or something.

Is it possible to make such changes from the host filesystem auto-detectable? And, most importantly, how to make transmission downloads auto-detectable? I don’t run transmission yet, but would like to run it via docker compose with other things like sonarr and plex, so it’s important that every container can share same data volume.