I have the same problem and created a ticket to ESRI tech support but no solution yet. "Warning: Attempt to present <UIImagePickerController: 0x1302c7000> on <AGSAttachmentCollectorViewController: 0x1335051b0> which is already presenting <UIAlertController: 0x12f69f340>" You can use the sample project from https://github.com/Esri/arcgis-runtime-samples-ios The project name is "OfflineFeatureEditingSample" To add attachment function works in simulator but not in iPad Air 8.1 device. Thanks!
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