Google ads.txt 404 error

I added the ads.txt to my theme repository and uploaded + activated it as advised in some tutorials to upload this file and fix AdSense issues.
But when going to the, as it is supposed to work, my page does an error 404 instead of showing the adsense text file.
Do I need to do something else, like adding a redirect in my domain manager or something within ghost itself?
cache is already reseted, but it doesn’t work

I uploaded also the same file with an other name try (it works), but with the slash at the end doesn’t work.

really strange…