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Dropbox won't sync files that you don't have read permissions.
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You'd better not merge an old Dropbox folder while installing/configuring Dropbox.
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You'd better not store symbolic links in the Dropbox folder, because the symbolic links will be replaced by the real files/folders when synchronized to other computers.
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It is not a good idea to put a Git repository into Dropbox. First, a Git repository usually contains lots of small files which downgrades the performance of Dropbox. Second, it is better to push a Git repository to GitHub, GitLab, etc.
References
- https://www.addictivetips.com/ubuntu-linux-tips/enable-dropbox-support-in-dolphin-file-manager/