I’m working with a client using the ArcGIS Experience Builder, and they were very interested in using the functionality to select a Dynamic Image source and choose the Attachment or Symbol to populate the image widget with feature layer attachments or web map feature symbols.
This works well for them when using the ArcGIS Experience Builder through ArcGIS Online, but when using the Experience Builder in Portal for ArcGIS 10.8.1 there doesn’t seem to be an option to choose Attachment or Symbol.
Is this a limitation to the current release of the Portal for ArcGIS release of Experience Builder?
The Image Widget in ExB starts to support attachment/symbol since v1.1, which was after Portal for ArcGIS 10.8.1 being released - that is why you could not see it.
The function will be included in the upcoming enterprise release, or you can use AGOL or dev edition for this specific feature instead for now. Hope it helps.