Missing text message that I have been typing for hours is now gone and I can’t find it. Where did it go

I had just been texting for hours in a group chat with four other people every time I would stop I would copy and save it and then I went back to it each time and it was there now. I can’t find it on my iPhone 15 Pro Max. Can anyone help me or tell me where to look because I can’t find it and I don’t wanna have to retype something that I don’t have a copy of and that I had spent all these hours on all last night and all this morning, anyone that could help me as soon as possible I would appreciate it. Thank u!