Smartnote Template location and logo issue in email

I had customized our LSN template to include our company logo a number of years ago. We have siince moved to a newer version (9.1) of LBI and I can no longer locate the modified HTML file. Can someone post the folder location that the default template is stored in on the LBI server? The second issue is that our logo is getting replaced by a red X in Outlook / Exchange emails. It appears fine on Smartnotes that are sent to printer devices so I know the logo is good and accessible by the system. I have the LBI sending email address flagged as a safe sender in Outlook but the logo is still not working. Has anyone experienced this and developed a workaround? As a side note, the logo URL is HTTPS and we don't currently have a certificate installed so not sure if this is contributing to the problem but i was going to change it to HTTP. Thanks for any suggestions.