Hi,
To be honest: I don’t know for sure why Murena cloned/forked some apps.
Some apps may have been modified for privacy concerns, or to integrate better with Murena ecosystem (including eOS on phones). But for some other it is not clear to me why Murena forked them… Maybe only for logo, translation, … ? Also it could be some additional bug fixes.
Anyway, upgrading them manually can lead to:
- something specific for Murena, not working correctly (including eOS on phones)
- problem with a future Nextcloud update, including possible data loss (app version in Docker image may be lower than current, manually updated, version)
- non-critical branding integrity loss (if some app include Murena graphic elements)
- loss of privacy
Please find here the Docker image build script: https://gitlab.e.foundation/e/infra/ecloud/nextcloud/-/blob/selfhost-25.0.8/Dockerfile (I didn’t find a tag for selfhost-26.0.8 
).
You will find that some apps are pulled from official repositories, some from Murena Gitlab.
Please be aware that in this script, official apps may also get some patches.
About Memories:
You may find in the script above that this app is official, pulled from Github then renamed to “Gallery”.
I couldn’t find any patch applied to it.
It will need some extra steps to be activated: https://gitlab.e.foundation/e/infra/ecloud-selfhosting/-/merge_requests/93#note_422733 (https://memories.gallery/install/).
That’s why it is not activated by default, this is unfortunately missing from install & upgrade guide 