u/Throw-Away0144

Hi. I made the switch from Samsung Messages to Google Messages because Samsung is kinda making us so. I did it last night. Check my messages this morning and find that some just aren't there. I went through to see what hadn't switched. This includes my conversations with my uncle. For background my uncle was killed in November and these messages are immensely important to me. The contact is still in my messages but when I click it there's no messages at all like we had never texted before. Is there a way to fix this? I'm panicking a bit because I don't want to lose those conversations.