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Cannot connect a Dropbox CSV

I am trying to upload data from a Dropbox file by URL, but it always says that something is wrong. When I upload the same file normally it works fine. When I use Plotly external URL method it returns me a very strange dataset which looks like a log of this operation, but not data.
Are there any specific requirements to format of CSVs from external sources? Problems with Dropbox connection? Restrictions of Community account?