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Is it possible to have an image attachment displayed as a thumbnail in an ArcGIS Online pop-up?
To display an image attachment as a thumbnail in the pop-up, the URL where the attachment is stored in the service must be referenced directly from the pop-up as a photo. This can be accomplished through the following steps:
Add the URLs of the image attachments as attributes in a field
Note: This option requires the use of ArcGIS for Desktop.Feature service image attachments can be displayed in a web map's pop-up by using the workflow and script provided in the GeoNet thread Show attachments in web map pop-up. The script converts the feature service attachment URLs to field attributes. The attachment can be displayed directly in the pop-up as a thumbnail after using the workflow to Show Images when configuring the pop-up.