Please see the steps below for clearing the hidden HTML text:
1. Open the Letter Template in the Editor and copy the Letter Text
.png?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly9kemY4dnF2MjRlcWhnLmNsb3VkZnJvbnQubmV0L3VzZXJmaWxlcy8xMTEyOC8xNDIwNS9ja2ZpbmRlci9pbWFnZXMvMSgxMTcpLnBuZyIsIkNvbmRpdGlvbiI6eyJEYXRlTGVzc1RoYW4iOnsiQVdTOkVwb2NoVGltZSI6MTc3MjUxODg0MH19fV19&Signature=GcohMhS4iIb5yKA-AMQBhSgcqVX654~MLmzUbqGfNapaKs0vlhyOxYhW8mDlmJUaZTxp~yviB91MQQ6r5waml4lrVNZGeceQI-slKxj2nKh8vhCvMA27UD3izJL1rimRLit094RFc9oe4i5EhlxfJZwWRvQ7bR3dh3CIfAHH7NwTt8GghTMerZoY1mn2M~O4RGG1H382V4haftL-9R65I~ezskm32HGfO0aZgfqsfN2nh8KTf1SVlqUTBMkHMck6x8QjJ-49Y6rG-aFWcECB52ACaXWEy3Eq8SFQL4D-lhDNPusSPfXHfpWcnBW6mI8M9ECq-O7WjmZy64-d330-VQ__&Key-Pair-Id=K2TK3EG287XSFC)
2. On your web browser go to https://html-online.com/
3. Paste the letter text into the left side HTML, then click on Clean
.png?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly9kemY4dnF2MjRlcWhnLmNsb3VkZnJvbnQubmV0L3VzZXJmaWxlcy8xMTEyOC8xNDIwNS9ja2ZpbmRlci9pbWFnZXMvMig2MikucG5nIiwiQ29uZGl0aW9uIjp7IkRhdGVMZXNzVGhhbiI6eyJBV1M6RXBvY2hUaW1lIjoxNzcyNTE4ODQwfX19XX0_&Signature=m4apAZRPSOLplWEHNeVXLmP18k-n1qt4ESUeKDOxgeCntPIJIGzDyJ9uhPx6GiFQuDDP4C~TFzpn3N23xbS~EgBJmE7KGRyVgytgHxYE2hNafBEdMIg2gYu5-FOu-fWeP2~i~lCqI61eX2stuFnR440WN9kc2m4lu9sRgNqj~4UwxWDk3whVMUWHZTvqBdlU1E5hyoeDlzRi~2zDsTRBMPZ9tb5et7YwcxrufAuywl0oM8k0XeALo-99IEVMYkdKjv6H59grZxTJJdV2-tOltIUfBennFHwRsRB62qXdMYybCbNVcbDnEvA8Sy3Ukw8DAZhU-FZ-3lBICoSnLjP~nA__&Key-Pair-Id=K2TK3EG287XSFC)
4. Copy the HTML from the right side after the HTML has been cleaned
.png?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly9kemY4dnF2MjRlcWhnLmNsb3VkZnJvbnQubmV0L3VzZXJmaWxlcy8xMTEyOC8xNDIwNS9ja2ZpbmRlci9pbWFnZXMvMygzMykucG5nIiwiQ29uZGl0aW9uIjp7IkRhdGVMZXNzVGhhbiI6eyJBV1M6RXBvY2hUaW1lIjoxNzcyNTE4ODQwfX19XX0_&Signature=dAL~btTluc-H~O6L6xqsu4qKxYPpkEjEFybntuYP3yweIHuVDbmXMGx3cTTYPeF4RHi2IU5AUevExXZb~FnYKpni8zNNBgHVVoHDkWCxsrMYnWw3lfgiW9O6ZggEu-UEHdTW-vhVH9NKHWauFMKgdrP9mhGvg9-aXa9xGZbb2rcUwhZnp-ZaCI7Zmx11gPXvli5W2VYtmdmU24om2LYnwa8s5DCoFS4MmeZLqwdNh3bohnRZxC~~307kTT1LW7A9E4wNNd2yENxGiOrJ6khCbXP9d5akBRdmxEHo0Fj1dxZllRxLd9BRaxNGoj9VdIQsSia9SdenGIf4C0SI4MnNVA__&Key-Pair-Id=K2TK3EG287XSFC)
5. Paste the HTML Text into the HTML Source Editor in Agentbox as per the steps below. Click update once added and then preview.
.png?Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly9kemY4dnF2MjRlcWhnLmNsb3VkZnJvbnQubmV0L3VzZXJmaWxlcy8xMTEyOC8xNDIwNS9ja2ZpbmRlci9pbWFnZXMvNCgxMSkucG5nIiwiQ29uZGl0aW9uIjp7IkRhdGVMZXNzVGhhbiI6eyJBV1M6RXBvY2hUaW1lIjoxNzcyNTE4ODQwfX19XX0_&Signature=cBnuQRNc~bhZ1RnTwhne3i2ThEEHYUtdvgytapC0zKybusExbTXr1n07ul~gHkzclqMCKYhrblQnIQKOasDfMxL4r8FoseGfdHklaMObPgignqfuhf98yGR5X3HFP3VjLKtSupjU~punm7biTH3M6NcjWpT6OdLTnKenqNgfXwD-~dy8LD1o5Pmby-OVBwmRpw0bKad-1ss963QK3UIFsQqA7vw0QsyDG8dFNpEpheyBp5-wK37~n7YQUzeR5GzPBkFkKBoNTL7AfDlcuiCBC~97vPiYfjPvhsakr~gN66apvDE9ldrxak9Gv2b5kVZ3-A8xEBnHoKv--k9YVA2NrQ__&Key-Pair-Id=K2TK3EG287XSFC)