In the latest version of uMake, I am experiencing a bug during export. If I export to file and save an STL, it works fine. When I later then try to export again, if I open the share sidebar all that I see are the options for where to save the file (files app, mail, airdrop). I can’t choose a different format, and the menu to go back is not shown. The only way around this is to force quit the app on my iPad.
You’re right, it looks like a bug when using the export panel in Split View. We will fix this.
Thanks for reporting!