I discovered just now that several GPS data tags are not included in the EXIF data when taking photos with the Lightroom app on my iPhone. The missing EXIF tags include 'GPSAltitudeRef', 'GPSAltitude', 'GPSTimeStamp', 'GPSImgDirectionRef', 'GPSImgDirection' and 'GPSHPositioningError'. When taking photos with my phone's default camera app, these tags are included, but when taking photos with the Lightroom for iOS app, the tags are omitted. I hope this can be fixed soon.