Adding pictures to an album does not use previewgenerator images thus therefore unusable slow

[MystikReasons]

Describe the bug
It seems that when adding pictures to an album it renders each picture. In the background I'm using previewgenerator https://github.com/nextcloud/previewgenerator but the photos app does not seem to take this into account.
Currently it is not usable due to the slow loading speed (I have more than 10'000 pictures and videos).

To Reproduce
Steps to reproduce the behavior:
Have a lot of pictures, create a new album and try to load old pictures which needs a lot of scrolling and loading.

Expected behavior
It should be instant and snappy

[joshtrichards]

Are these recently uploaded images?

With the offline previewgenerator app, the pre-generated previews don't exist until it next runs.

So if a preview doesn't yet exist, if some transaction needs it, Nextcloud generates it on demand.

What would you expect to happen instead? No previews be shown?

Just trying to make sure I understand what you're reporting.