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Images captured with an iOS 11 device (iPhone X, iPhone 8 Plus, and iPhone 7) can use the High Efficiency Image Format (HEIF) image format, also known as HEIC. When submitting the survey with an HEIC image attached to an image attachment question, the submission fails with the following error.
Error: This survey was not able to be sent due to the following error: Code 400
HEIC files are not supported by Survey123 for ArcGIS. This is a known limitation.
Prior to capturing the image with the iOS device, change the camera setting to save captured images in another supported format, such as JPEG. The camera setting of the device can be changed by using one of the following methods.
Note: Live Photo is re-enabled every time the app is launched. To maintain that Live Photo remains turned off, go to Settings > Camera > Preserve Settings, and apply the setting to be preserved for Live Photo after it is turned off.