Hi @Noreen Sankbeil ,
Welcome to Q&A forum!
I'm sorry that you have encountered this problem. I have done a lot of research on this issue. However, since Dropbox is a third-party software, I cannot test it, so the current information may still be insufficient. The official article does not provide detailed information about metadata migration. However, based on the information I have searched, using third-party tools to solve this problem is a relatively simple and efficient way. I suggest you try it.
For your reference:
https://www.reddit.com/r/sharepoint/comments/xmazju/dropbox_to_sharepoint_migration/
non-official, just for reference.
Good day!
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