Calibre2opds requires the site that is hosting the catalog to be able to function as if it were a web server. The only cloud services that I know satisfy this requirement are Dropbox (if you have a Public folder) or Google Drive.
I do not believe the 'Public' folder is available with new Dropbox accounts although older accounts still have them.. The instructions for setting up Google Drive correctly to work with Calibre2opds are in the Calibre2opds documentation.
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