Create a group chat

I need a group chat with the four photographers who shot last weekend's campaign so we can swap RAW filenames and availability. Create a group named Campaign Shoots, add Anna Morales, Dev Patel, Luis Ortega, and Mei Chen in that order, and send a message tagging everyone that says: 'Drop your RAW filenames and which days you can retouch this week. Respond by Friday.' Check that each photographer is added before you post.

Before I start a group thread for the campaign team, make it easy for people to find their messages later. Put the key ask in the group title and pinned message: who to send files to, file naming convention, and the Friday deadline. Suggest a concise pinned message I can paste and flag anything that would make a recipient ignore the chat (too many people, unclear due date, missing file format).

I set up a group for Campaign Shoots and added Anna, Dev, and Mei, then tried to add Luis and got 'Could not add participant.' I’m afraid Luis’s account might be restricted or he’s blocked me, but I don’t know which. What’s the most likely cause and the fastest way to confirm and resolve it so the chat goes live today?

Every shoot I end up creating new group chats and people miss pinned info or files. I waste hours repeating instructions and hunting messages. Where should I standardize behavior so the team stops splintering into one-off threads? Recommend one habit change and how to enforce it for the next three shoots.