You can usually do it through the settings or preferences option in the relevant software or platform. Just look for a 'folder management' or 'add folder' option.
The easiest method is to find dedicated comic conversion software on the internet. Many of them have simple instructions that guide you through the process of converting comics to cbz. Just make sure the software is reliable and compatible with your comic files.
CBZ is often preferred for comics as it's a simple archive format that retains the original image quality. Epub might reformat the pages, which could affect the comic's layout.
There were a few local comic readers that he could recommend. The first one was Wooo Comics. It was a local comic reader that supported WebDaV and the Web. It could import and read comics in a variety of format, and there was also an AI image quality enhancement function to improve the image quality. The app also had folder management, streaming reading, browsing history, and other functions, all of which were currently free. In addition, iComics and PixStoryAI were also two recommended local comic readers. iComics supports a variety of comic format, with support for changing file names, zooming and locking, etc. The interface is simple and has no advertisements. In addition to supporting a variety of e-book format, Ruyi Manga also had features such as AI technology to improve the quality of pictures and translate the text in pictures. In addition, Tachiyomi was also a free and open-source comic reader that supported online reading and downloading. It had multiple viewers, reading directions, and other settings. The above is a brief introduction of several local comic readers. I hope it will be helpful to you.
I'm not sure about specific places to download manga in CBZ format. You might try some manga-related forums or communities to see if anyone there has suggestions.
Tachiyomi was a free and open-source comic reader developed specifically for Android users. It supported the online reading and download of comics, and provided thousands of comic sources from all over the world, including Chinese, English, Japanese, and many other languages. Tachiyomi's interface was simple and refreshing, and the operation was simple. There were no advertisements. The user could choose to install the plug-in according to their preferences to obtain the comic resources they needed. The app also has a variety of reading modes and customizations, including bookshelves, discovery, grouping, reading statistics, topics, tracking, automatic updates, and backup. Overall, Tachiyomi was a powerful and resource-rich Android comic reader.