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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 25.0.5.1
Operating system and version (eg, Ubuntu 20.04): Welcome to Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-1026-raspi aarch64)
Docker
Nextcloud AIO v4.7.0
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): replace me
The issue you are facing:
I have installed Nextcloud AIO on a server with 4TB RAID1 configuration. the disk shows 2% full but when I try to drop a folder from my windows desktop into the group folder it says insufficient space
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Drop a folder structure with 13 folders of 16.2GB with 973 photographs and videos in it.
I have dropped folder 2022 in successfully but folder 2021 will not go
cloudadm@cloudsrv:~$ sudo df -h
[sudo] password for cloudadm:
Filesystem Size Used Avail Use% Mounted on
tmpfs 781M 3.5M 778M 1% /run
/dev/md0 3.6T 43G 3.4T 2% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/mmcblk0p1 253M 189M 64M 75% /boot/firmware
overlay 3.6T 43G 3.4T 2% /var/lib/docker/overlay2/7cb9924e700f5872e96c5369fd38f4f48ce1aeedb2fa455c11a1f4fd5028df2e/merged
overlay 3.6T 43G 3.4T 2% /var/lib/docker/overlay2/7c6bd5f135b4d579c22b2ad65f772868b7bb2b7f89f2ab27bda7f198f86579ef/merged
overlay 3.6T 43G 3.4T 2% /var/lib/docker/overlay2/5512def5c9a0a107f334c62607ec7d13a81617536dd09f4c6c069e98af642262/merged
overlay 3.6T 43G 3.4T 2% /var/lib/docker/overlay2/502e64330e50879f029863a7a7694e4b28409008fdac0993d40e192cc124003d/merged
overlay 3.6T 43G 3.4T 2% /var/lib/docker/overlay2/50c8f1b0afe63be296749154ec67f35d790d4dce5352d9c5ff2496fc2ef7cac4/merged
tmpfs 781M 16K 781M 1% /run/user/1000
Link to support extract
Removed
I have copied in a load of smaller files and the free space has reduced accordingly but still nothing seems to be full.
Can anyone help find out where it is?
I can supply any additional diagnostics but am not a Docker expert so I will need explicit instructions on how to do it.(I can open the console on the containers)