Hi Simon!
I can repro the issue.
Steps to repro:
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Initiate the standard tutorial with Discobot
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Until it asks you to upload a picture.
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Reply without uploading a picture
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Discobot provides a picture from Discobot’s plugin: https://meta.discourse.org/plugins/discourse-narrative-bot/images/dog-walk.gif
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Opening the image in a new tab works, but clicking the image leads to a not found page.