Obsidian on Onyx boox Max Lumi 2 single notes shown in Downlad folder

Things I have tried

Hello,
i have synced Obsidian between PC, Android smartphone and Onyx Boox. When i connect the Onyx Boox to my PC all notes are in Download → Obsidian. If I enter the Download folder from the Onyx Boox the folder Obsidian is not visible and every single Obsidian note is shown. How can I change this? Perhaps this is a Onyx Boox problem and not so much Obsidian specific …

What I’m trying to do