That's working as expected. An upload directly during a post is not like an upload to CB Gallery directly. It's uploading an attachment to a standard post which means the post is going to have a normal activity asset. There isn't a way to improve that notification title yet since it's a compounded title. Will see if it can be improved further, but can't be certain it will be possible at this time until this is all redesigned in a later release.

Have added to feature tickets as believe I should be able to improve this somewhat.

forge.joomlapolis.com/issues/8249
forge.joomlapolis.com/issues/8250

The issue is the notification isn't about a comment on a CB Gallery entry. You're commenting on a standard post. This is why you get the asset of activity.ACTIVITY_ID.comment and is perfectly normal and as expected. It then calls further APIs to parse out the title of the activity post that was commented on and that is where I should be able to make some further improvements to the wording.

Ok, was able to implement a generic notification case for CB Gallery. It will display as follows.

OLD:NEW:
This is a separate language key as well allowing customization of that specific scenario. Does the language of that make more sense to you?

This should now be available in latest build releases. Unfortunately there's not much more room for improvement right now. Once streams and storage behavior for activity, notifications, etc.. has been redesigned it will be significantly easier to appropriately title everything. I don't have a time frame for those redesigns though as we need to push forward with implementing Symfony components so all of CB can be improved.

The following language strings should now be available.

Key: ABOUT_TYPE_TITLE_IN_ALBUM
Text:
Key: ABOUT_TYPE_TITLE
Text: