"My Books" shows epub, svg, config files

Hi all,
I’m a complete newby in the e-readers world.*

I just bought my first ereader (Kobo Libra 2) and already installed KOReader without any problem.*

I just realized that i can side load my drm-free ebooks without KOReader.*
The main reason to install KOReader was the ability to connect to my Dropbox.*

I’m having some trouble with the Dropbox connectivity. I have already created the app and generated the token as explained in other posts and then I copy the token to a text file which I copy too the device over the usb cable and the copy the token with the koreader integrated text application. It keeps showing the message “Cannot fetch list of folder contents”.

Does anyone have this issue?

The other thing that i noticed and don’t know it it’s the usual behavior is that the “My Book” is showing the epup files and also configuration files from koreader. For instance i see a lot of svg files from path “/mnt/onboard/.adds/koreader/resources/icons/”.
Does anyone knows why this happens? I’d like to see only the PDF/EPUB files in “My Books”.
I’m new to koreader and maybe i have changed some setting without noticing.

David