Increased bootdisk size not showing (and working) under summary

[Elmbob]

Hello there,

I have a Jellyfin-container on Virtual Environment 7.4-17 running. It was smoothly running for months without any problems and no changes being made. Now I cannot access the mediaserver, it looks to me that the bootdisk is full:



So I increased the bootdisk size in the GUI via Resources -> Root Disk by 4GB & rebooted the node. Now it shows a size of 20G:



Under local-lvm -> CT Volumes it also shows a larger size:



But in the summary nothing changed: still 16G and 96% used. Still not responsive. Where is my mistake? Do I have to console in the container and increase manually?

 

[Elmbob]

"df" is giving me the following:

Filesystem                                    1K-blocks       Used  Available Use% Mounted on
/dev/mapper/pve-vm--102--disk--0               16425940   15673624      22916 100% /
//192.168.0.21/Sandserver/Syncthing          2880033088 2538827576  341205512  89% /media/Dokus
//192.168.0.21/Spanplatte                    1953497084  904212472 1049284612  47% /media/Bilder
//192.168.0.21/Spanplatte/Dokumente/_E-Books 1953497084  904212472 1049284612  47% /media/E-Books
none                                                492          4        488   1% /dev
udev                                            3964680          0    3964680   0% /dev/tty
tmpfs                                           3999452          4    3999448   1% /dev/shm
tmpfs                                           1599784      37984    1561800   3% /run
tmpfs                                              5120          0       5120   0% /run/lock

I do not know much about filesystems etc., but to me it looks like Proxmox shows a increased disk size in the GUI and in reality it stays the same?
Did anybody else stumble about this problem?