### Phase 6 — THE 3-MAJOR JUMP: 31.0.14-apache -> 34.0.1-apache, via the real Update button
2026-09-01T19:00:53Z
file now:
    image: nextcloud:34.0.1-apache
container BEFORE:
nextcloud:31.0.14-apache status=running
### POST /api/stacks/nextcloud/update:
{"ok":true,"message":"Stack nextcloud update completed"}

HTTP=200
2026-09-01T19:01:40Z
### what the app itself says after the 3-major jump
2026-09-01T19:01:50Z nextcloud:34.0.1-apache|Restarting (1) Less than a second ago 
2026-09-01T19:02:06Z nextcloud:34.0.1-apache|Restarting (1) 10 seconds ago 
2026-09-01T19:02:23Z nextcloud:34.0.1-apache|Restarting (1) 13 seconds ago 
2026-09-01T19:02:39Z nextcloud:34.0.1-apache|Restarting (1) 4 seconds ago 
2026-09-01T19:02:56Z nextcloud:34.0.1-apache|Restarting (1) 20 seconds ago 
2026-09-01T19:03:12Z nextcloud:34.0.1-apache|Restarting (1) 36 seconds ago 

### THE EXACT MESSAGE — container logs since the update
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
=> Configuring PHP session handler...
==> Using Redis as PHP session handler...
Initializing nextcloud 34.0.1.2 ...
Can't start Nextcloud because upgrading from 31.0.14.1 to 34.0.1.2 is not supported.
It is only possible to upgrade one major version at a time. For example, if you want to upgrade from version 14 to 16, you will have to upgrade from version 14 to 15, then from 15 to 16.
