Thanks for the Google Drive hack. Sharing permissions matter for Drive btw: must be set to ‘Anyone with the link can view’.
Does anyone know the equivalent for Dropbox?
The usual link sharing looks like https://www.dropbox.com/s/v66ir6ozqctc26u/insta.png?dl=0. Renders in HTML, but not when copied into Gmail signature (alt text displayed instead).
Inferred that ‘dl’ = ‘download’. Tried replacing the dl=0, with dl=1 to replicate your ‘direct download’: https://www.dropbox.com/s/v66ir6ozqctc26u/insta.png?dl=1 and as you’ll notice, it does direct download.
However, still doesn’t render in Gmail signature.