It would be useful to have the ability to add additional fields for improved symbology and labeling of the track layers. This could be done either by allowing the addition of new permanent fields in the track layer and then adding support for attribute rules to update them in real time or by adding support for table joins for real time value lookup. A use case would be to label last known location points of public safety personnel by call sign and then symbolize them by type (fire, police, etc). I am aware that ArcGIS Online does not currently support attribute rules, but there is an idea page for it (see link below). Table joins to the track layer could be done in GeoEvent server (or possibly ArcGIS Analytics for IoT), but this is cost prohibitive and the only desired functionality from those products is the lookup functionality needed to enrich the data. https://community.esri.com/ideas/16977-support-for-attribute-rules-in-arcgis-online
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I just had to deal with this issue (photos showing correctly in IE and Chrome, but not Firefox). This is what I found: If the URL to the photo uses backslashes it will not show in Firefox. Example: http:\\www.yoursite.com\photo.jpg Make sure your URL is using forward slashes and the photos should show. Example: http://www.yoursite.com/photo.jpg A URL with backslashes will correct itself when pasted into the Firefox address bar, but when such a URL is embedded it breaks. Not sure why this is an issue in Firefox, but I hope this solves your issue.
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