In the folio builder panel, select your folio and choose Rename Folio from the panel's pop-up menu.
Issue
When you download either the developer_viewer.ipa, or distribution_viewer.zip, for a built-in single edition app, the process fails. You receive the error "Sign in failed, please try again."
One or more of your built-in folio's articles contain upper-ASCII or other special characters, such as accented characters, ampersands, or parentheses.
Solution
Remove any accented characters, such as é, ü, å, and other special characters such as & and ) from the article names in your folio, and the folio name.
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Rename the folio to use only a-z, A-Z, and 0-9.
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For each article, do the following:
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In the folio builder panel, select the article and choose Rename Article from the panel's pop-out menu.
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Rename the article to use only a-z, A-Z, and 0-9. It's best practice to avoid use of spaces to make cross article navto:// links easier to manage.
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Review all of your navto:// links and update them to use the new article names.
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With the article selected in the Folio Builder panel, choose Update from the panel pop-up menu.
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From the Folio Producer web app, select the folio and click Update.
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From the Folio Producer web app, click the Export button to export the updated folio and download it to your local computer.
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In the App Builder, select your app and click Edit.
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Select the new folio .zip file created in step 5.
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Rebuild, then download and sign your app.
Additional information
Adobe is actively pursuing additional solutions to this problem and hopes to address it in a future release.