Using cloud storage folders - incl Dropbox, Google Drive, OneDrive
Storing your images on a personal Cloud storage account is a great way to backup your photos. There are some specific settings when using cloud storage providers that are necessary for proper operation with TTP - all images must be stored locally on your hard drive.  Using the "smart sync" options for Dropbox, OneDrive, etc. does NOT work for Tag That Photo.  
Here is a screenshot of the settings for OneDrive as an example:
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