What are the sharing options for markups in Explorer for ArcGIS?

Answer

Starting from Explorer for ArcGIS 17.1.1, users can create and share markups; these markups can be shared directly with other Explorer for ArcGIS users or with other members in an organization through ArcGIS Online or Portal for ArcGIS.

The following are three possible methods to share markups in Explorer for ArcGIS:

• Screenshot the markups and share via email
  
  Markups can be shared as screenshots (.jpeg files). However, image files have the disadvantage of being non-interactive.
   
• Share the .markup file via email
  
  By sharing the .markup file via email, the recipients are able to interact with the markup using Explorer for ArcGIS. The .markup file can only be accessed with Explorer for ArcGIS, and is not accessible with ArcMap, ArcGIS Pro, or other ArcGIS Desktop applications. This method is often used for direct user-to-user sharing between multiple users of Explorer for ArcGIS (field-to-field sharing). For example, a user out on fieldwork can share the .markup file with other users.
   
• Share the markup via Portal for ArcGIS or ArcGIS Online

  Note:
  This method requires Level 2 Named User access in Portal for ArcGIS or ArcGIS Online. For more information, refer to ArcGIS Help: Levels, roles, and privileges.

  This method exports the markup to a Portal for ArcGIS or ArcGIS Online account. The markup layer or feature collection is exported to the My Content tab, and can be added to the web map. However, the items are not automatically added to the web map. This method is often used when sharing markups from the field to the organization (field-to-office).