When a member's solo teaser, intro film or MV shows up on the group's official channel, it can look confusing at first. Groups often use their shared channel as the main home for everything under the group's name, including members' solo projects. So the channel name only tells you where the video was posted. It does not tell you whose release it is. A quick way to avoid mixing things up is to ignore the channel for a moment and read the title first.
The title and the first lines of the description do the real work. A title such as "Member A The 1st Mini Album" followed by a date names the person and the release in one line. The opening lines of the description usually repeat that, with the release date and the format. A solo release is credited to the member, even when the group's hashtags and links appear further down. Those extras are there because the post lives on the group's channel, not because the release has turned into a group release.
Links deserve the same careful reading. The social accounts listed under a solo post are normally the group's shared official accounts, and the member may also have personal accounts that are listed separately. Fan community links usually point to the group's community rather than a space made only for the solo. Some solo releases are not on the group channel at all and are posted on a label channel or a distributor channel instead, so check the title, not the channel. To find a release, search the member's name plus the release title.
Dates can add one more layer. When a member is active in two markets, a post may carry two time-zone labels, and the date written applies to both labels only as written, so avoid converting it into something the post did not say. There are honest limits too. A post may not say whether a solo is a one-off or part of a series, and a member's solo does not by itself say anything about the group's plans. If the description does not say it, we do not know it.