I saw other topics on the same topic but none has been resolved.
The image created via HTMLtoCSS is accessible. I even added a 10 seconds sleep to be sure. The strange part being that when I do it manually, it works, but not when scheduled.
Is it possible that when you run it manually it runs in your browser with connection data that makes it work?
Do you have the same behaviour if you run it in an incognito window or a different browser that isn’t connected to your IG account? Kind of a stab in the dark, but…
are you running it with the same data? Compare the input bundles in the manual run vs the scheduled run and see if its the same type of file being sent to the Instagram module.