Great.
And I can confirm that indeed the external SD card was the problem.
I was a bit baffled about not being able to the internal storage. And the storage icon wasn't that intuitive to me so thanks for the hint.
I could successfully open a mcsz and an abc file from internal storage.
And I can confirm that indeed the external SD card was the problem.
I was a bit baffled about not being able to the internal storage. And the storage icon wasn't that intuitive to me so thanks for the hint.
I could successfully open a mcsz and an abc file from internal storage.