Well, I have ALL my books in MapleRead SE on my iPad Minis (I don't use my iPhone to read ebooks) and I only have to get them in there once, so no problem. Perhaps you should get your next iPhone with more storage? My iPads (& my iPhone) just have 256 GB yet my entire MapleRead Library only uses 7% of it, a meager amount, so I haven't felt the need to go up to 512 GB or 1 TB.
However, if you want to continue to use Dropbox, you should see if a Dropbox forum can help you with its search function. There may be a trick you're missing. I don't use Dropbox much anymore as they have been continually depreciating its functions/features over the past several years.
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