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Challenger Viewer - Limit of 20 Comics / Folder using OPDS
First, thanks for making a super application - it works very well.
I can't seem to solve an issue - using Challenger Viewer, I can sync OPDS-COMICS from Ubooquity however for some reason if a folder on the server contains more than 20 comics, Challenger Viewer will only group them into clusters of 20 per thumbnail - then will begin creating additional groups of 20 in a new generically titled "Comics" thumbnail rather than using metadata names.
Web viewing works just fine - not sure if this is an Ubooquity question or a Challenger question?
Aside from this little frustration, Ubooquity works very well as a home-based book server!
Customer support service by UserEcho
You can try to set items per page in the Ubooquity settings. Set a higher number like 1000.
The OPDS feed is served page by page, each page containing a few items (in your case, 20).
So the solution offered by Seth will probably work, but will serve huge OPDS pages (not really a problem though).
The real cause is probably the pagination managament done by Challenger Viewer. You should try contacting its author.