It seemed from what I’d read that this might not work BUT I thought I’d learn something by trying anyway. Success beyond what I’d hoped — I can edit and save.
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First I uploaded a single Tiddlywiki file to Dropbox, then added my images folder.
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I downloaded Good Reader from the iOS App Store. In the app I clicked on the “plus” icon and connected to my Dropbox account.
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Downloaded the file and image folder to the iPad (via Good Reader’s file management).
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Open the TW-project.html within Good Reader’s “browser” — and everything looks perfect. I can edit and save tiddlers, so theoretically should be able to upload the updated file back to Dropbox.
Since I hadn’t found this solution elsewhere, I hope this post is useful to others.