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PaulThe file names don't have any forbidden character.  Just letters.  They are well under 128K.  I can get as far as uploading the file into "temporary files" and seeing a little picture of it on the right side of the dialog box.  But when I click on "insert image" nothing happens.  No error message.  Nothing.  The dialog box closes and nothing appears.
By the way, I'm not complaining.  I know it's not your fault and you don't get paid.