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For each resource (file) added, you may manage its permission settings. You should limit the use of the files to within your own App as a good practise.
Figure 1: Properties & Export - Resources
Figure 2: Properties & Export - Resources - Add Resource
Add Resource allows you to upload a file to be added into the App.
Figure 2: Properties & Export - Resources - Edit Resource
Edit Resource allows you to manage the individual resource file. You may obtain the relative URL to access the file or make use of the hash variable given within the scope of the App for convenience. The hash variable would resolve into a relative URL same as the "URL" given.
The access of the file can be managed through "Permission" attribute.