Indeed, Ubooquity does not support SVG covers.

But it does not require epub v3 either. So I guess that the conversion had another side effect that fixed the files.

As for the launch script, if you have a better version I'd be happy to replace the current one with yours (as long as it remains simple, I want it to be an understandable entry point for users).

No promise, but I'll probably take a look.

Ubooquity uses H2 in embedded in-memory mode.

As far as I know, this mode does not allow multiple connections.

In any case, I think an API would be more adapted to your use case.

This is indeed more a problem of compression level than compression format.

Oh, you mean you want to display several nesting levels on the same screen ? (like in your first screenshot)

If this is the case, Ubooquity is indeed not capable of that.

Ubooquity displays root folders (the one you explicitely share in the admin screen) as text (the black text on grey background, your second screenshot), then all subfolders are displayed using the cover of the first found book/comic in the subfolder (and using the name of the subfolder).

What I meant is that there is no limit on the number of nesting levels you can have in your collection. But you'll have to click 4 times (for instance) to navigate to the 4th level, and have 4 different pages.

Why would you prefer it ?

Same answer: probably not too hard to do, but remind me once I've managed to do the first part of the job. :)

There is no such option, the online ebook reader is indeed made to read epubs that consists mostly in text.

The behaviour you describe (navigating using edges) is the one of the online comics reader (used for cbr/cbz/pdf files).