The ArcGIS REST API’s Item Data allows to access the data component of an item, such as download a layer package or get the web map’s JSON. You can even use this functionality to host images to support your story map although it might get tedious to set up if the number of images is very large.
Zip it!
Optionally, you can have downloadable items, such as layer packages and map packages, zip by adding the URL parameters f=zip. For example: http://www.arcgis.com/sharing/rest/content/items/8adf6db6ca5f4140b73b3a2e053753e6/data?f=zip
This will change the file extension *.lpk, or *.mpk to *.zip.
Please note that item data access, via ArcGIS REST API, is not available for free ArcGIS Online account (i.e. account that are not part of an organization).
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