Now that the new IpadOS 13 is available, this would make a great addition to Skydemon for those of us using Garmin avionics.
There is already a workaround: you can share your flight plan and E-mail to yourself. Then in the received E-mail, you can select the *.fpl file and save it to the SD card.
When using directly the "Share as" and then "Save to Files" in Skydemon , only the Skydemon specific format is used.
So I guess one way to get this solved is to ensure that with the "Save to Files" in skydemon, all formats are saved as is the case when you send an E-mail.
Any chance of this being in one of the next releases ?