I'm using an html file for a signature using local images with links associated to the images and so when I write a message I don't see the images nor the links (if I hover over them), just placeholder boxes the size of the dimensions I specified for each img. Now I'm not a seasoned frontend dev, but I have made a few websites already and know how html+css works and if I don't know I'll check the developer.mozilla.org site (among others). If I send myself a test message, when I open it I see only the image placeholders, although the corresponding links are there (the cursor changes and I see the link on the bottom). Yes the html file works since it displays fine in any browser and in TB my message view is set to both html and text. I thought it might have been the Environment Path variable that didn't include the image file path (made no difference). I also put an exception in the Mail Content section in the Privacy and Security settings (made no difference). So it doesn't matter if I use a file (via the global settings) or if I use a signature plugin (Signature Switch). I know browsers are pretty forgiving, but if the html was really the problem I'd see it (and VS Code would also probably let me know if something was incorrect). And the Signature Switch plugin uses just the bit of code within the body tag, no need to include the header that's in the html file. I've seen many bug reports on this subject that are either archived or set as "''solved''", but it doesn't appear to be really "solved"! Oh and my TB is on auto update and I'm on Win10. The only thing I can add is that in the preview pane in Windows Explorer, when I click on the html file, the images are also shown as placeholders and on top of the pane there's a message saying the images have been blocked...so I don't know if it's a Windoze thing only or not.