Messages on iPhone not appearing on M1 MacBook Air
Some of my messages from just a few contacts are not showing up on my new M1 MacBook Air. They show up on my iPhone only. I have Messages in iCloud enabled on all my devices. On my iPhone, I went to iCloud settings to be sure that Messages was checked. On my Mac, I opened the Messages app, then went to preferences to be sure that "Enable Messages in iCloud" was checked. I finally contacted Apple Support, and the agent had no idea what to do. She disconnected the call. I haven't called back yet to see what else I can try.
The person who I've been texting on my iPhone has an Android phone. I generally cannot text him at all (same for others who use Android phones) from my MacBook. I can sometimes send him links if I generate the text on my iPhone, but not always. I cannot forward PDFs ever. Today I texted him quite a bit on my iPhone, but when I moved to my MacBook Air to continue texting him, none of the entire morning's texts was there. I tried using the synch button, but nothing happened.
MacBook Air (2020 or later)