In meeting chat

I was in a class. My teacher sent a document to all of us. Some students received it but others(including me) didn't receive it. He sent it several times but I didn't get it. I was logged into the meeting through the android app while my teacher has logged into the meeting with the desktop app. Is there a difference between desktop and android in meeting chats? Is it impossible to access a sent document in in-meeting chat using the android app?