Sync .md file to Windows10 machine fails

Hi, I have a nexcloud 17 running en sync group folders with my windows10 machine. If I create a textfile in nextcloud through a browser (.md-file), it is not synced to my Windows machine. Ik create a textfile (.md) on my Windows machine it IS synchronised to NextCloud. I don’t have ‘ignore’ settings for .md files in the windows nextcloud app. Does anyone have any suggestions?