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Thanks Alexaander, I can sort of work around it by copying and pasting into a "temp.html" local file for editing/previewing, then copy/paste back into the original file before uploading back to the host. Kludgey, but better than nothing. Textastic is still far and away the best coder's editor I've found for iPad. The font sizing and pinch-zooming are great (I have severely impaired eyesight, so I use those features all the time) and the SFTP integration makes website updates fast and easy.

Let me know if you want me to beta test a fix for the question mark filenames.