As far as I know, the only cloud sync/backup service that allows you to store files with relative links within the service, basically what you need for one file to link to other files in the cloud, is Dropbox.
When you share or login and view a file, for example, the catalog index, it will be dropboxusercontent.com/get/random/folder/linkage/root_of_shared_folder/names_of_files_and_folders allowing the catalog to work, since in that view mode, it is exactly like a folder uploaded to a server viewable AS A FOLDER!
You could also get a server host and upload to there, but probably don't want to bother... You're stuck with dropbox until/unless some other cloud solution offers the same feature.
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