Synology NAS + App Android

I set up a YACReader server on Synology NAS, but I'm having problems.
Using the muallin container via the web interface I can see my files, but if I connect to the android app it tells me to update the server to the new version (muallin hasn't been updated for more than a year).
If I use the official container both on the web interface and on the Android app, it shows me the name of the library created, but if I click on it it gives me nothing, it remains stuck on the name of the library without going to the folders

Can I see a screenshot or a video? You should be using the official one.

Now I'm only using the official one. for the android app I solved it by moving the files to a docker subfolder. via browser, however it remains blocked as shown in the image below and I cannot see the subfolders as via the app. when I click on the "Fumetteria" button the page refreshes and does not return the subfolders.

imagizer.imageshack.com/img922/333/7UvLWk.png

I solved it by moving the folder, as indicated before, and changing browsers. I don't know why, but it doesn't work with Chrome. Thanks for the answers and patience

But that’s the old web, the Android and iOS app have now a native browser.