Although some 3rd party iPhone/iPad accessories may solve this issue, the OEM Apple SD Card Reader for iPhone/iPad will not read files generated by the K1 if the firmware is 1.0.6 or earlier. This is because iOS can only recognize files that have file names with 8 characters or less. Prior to firmware version 1.1.0, the files generated by K1 has 12 characters.
It is recommended to update the firmware to the latest version for the K1 to save files that meet up with iOS standards. If you already have some files generated by the K1 before updating to 1.1.0 or later, it is recommended to download the files manually by using the K1 App or connect the SD Card to a laptop/desktop.