Just for some clarity (before raising the issue with tech support)...
Can anyone upload a photo with Android and Collector 10.3.7 in online mode?
I can see in Fiddler the call to upload the features:
https://webadaptor.dev.rfs.nsw.gov.au/arcgisserver/rest/services/FieldObs/UAT_SitReps_03hr/FeatureSe...
though nothing to send in the attachment.
Our environment all works ok with iOS devices.
I can't do a trace on the iOS device as Fiddler causes an error:
The 'Proxy-Connection' header must be modified using the appropriate property or method. Parameter name: name
I think the iOS Fiddler error is just a distraction for me right now
Thanks