Size alone is not reason not to fix issue.
I do have some earlier (before they went subscription) Meng To (
https://designcode.io/) books. 593 and 1361 Mb. Epubs. (epub3 with videos). They are paid-for.
I also do have Tales from Shakespeare (version for testing read-aloud functionality) (As far as I understood - it's public domain book from public domain sources. Check at
https://www.readbeyond.it/ebooks.html )
Many raywenderlich.com tutorials in 100-250 Mb range (at least ones I bought from them)(they have both epub3 and PDF versions).
Some graphical stories I got from my subscriptions at
https://subscribestar.adult/ are in 350+ Mb range.
If there is a problem with large books - it should be fixed if possible.
It shouldn't matter how exactly this issue was found.
I check OneDrive with Shackespeare's ReadAloud epub book from readbeyond and 1+ Gb one from Meng To. CC crashes.
Crashlog looks different (but contains several
2020-05-20 14:54:19.665: uncaught exception
java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack trace available)
Full crashlog send using in-app reporting function.
So there is yet another problem with cloud library integration -
.