FWIW if it turns out it isn't filename length and it turns out Chrome O/S views external SD cards similar to how newer Androids view OTG storage and you can't do any mount stuff or adoptable storage stuff and you're crushed by extremely limited and/or weird storage scope I know that ComicScreen app will access OTG SD. Far from ideal as you can't filter by tags or series or whatever to handle a large collection and you can only sort by filename (plus date stuff) to find what you want in a large collection but it will actually read what relevant comic files you have on your SD that you can use CC to send down to the card.
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