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FOSS ereader app that syncs the page read?
(lemmy.dbzer0.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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FBReader might be an option. You can upload books using the FBReader Book Network, which uses your Google Drive as storage, and then use it to access your books and synchronize your progress across a variety of platforms.
The Android version of FBReader has been closed-source for a number of years now.
It looks interesting, but I don't know if I've got enough space on my Google Drive. I'll have a look into it though, thanks :)