We are sorry to hear you are having issues migrating your data. It is actually too late to do that at this point since the underlying data service has gone away and the older apps are no longer functional. There were multiple warnings via in app popups, emails, and Dashboard posts calling this out.
Your email address was sent emails on June 9 and November 25 regarding this matter. They included the following:
Your current copy of the app will continue to work but we can't guarantee all features will continue to function properly beyond May 15, 2021. Anything related to elevation/tile services, flight log syncing, mission syncing, and automated mission naming will cease to function at some point. As long as you are not using any of those features the basic functions should continue to operate until the end of the year.
This was your warning that your ability to sync your missions to Maps Made Easy would be going away.
Here is another post with the same topic that has suggestions for workarounds.
https://support.dronesmadeeasy.com/hc/en-us/community/posts/4414778001556
